WesWorld

It seems very low compared to the historical vehicle. Historically it's 2.99m to the turret roof and 2.50m to the gun centreline. Probably getting on for 3.5m with a larger turret for the 6" howitzer as per the KV-2.

The KV-2's turret is a very odd shape, causing the extreme height, which is by no means necessary. Take a look at the US T29/T30 series vehicles, which mounted more powerful weapons than the KV-2, as an alternative (though this vehicle wouldn't need that big a turret either, with a 23 caliber 152mm vs a 40 caliber 155mm on the T30). The M6 wasn't as tall as some vehicles, either, it was only 2.38m to the turret top (not counting the cupola and the MG mount).

The other thing to note is that this vehicle really needs some work in it's design: more than half the main gun ammunition is stored in the hull, where it will be hard to access in combat. As a combat vehicle, it definitely needs work, but that's why it's a prototype.

Quoted

The M6 wasn't as tall as some vehicles, either, it was only 2.38m to the turret top

I'm not sure about that, it looks quite a bit taller. The specs here give 3.00m and they're usually accurate. More telling is the fire height of 2.50m, which obviously doesn't correspond to 2.37m height. I've just measured a line drawing as well which agrees with the above.

A tall turret is needed if you want the gun to have reasonable elevation (probably useful for a howitzer). 55 rounds of ammunition seems like quite a bit as well.

I had a good crawl over lots of tank, IFVs and SPGs last week (modern and old). There weren't really any you'd call roomy, even without other people, equipment and ammunition in them. Challenger 2 and Chieftain (apart from the gunner) probably had the most room. SPG70 and AS90 are large inside, but it's mostly filled with the 155mm gun, shells and cartridges.

The gun doesn't need a lot of elevation, it's a direct-fire weapon, not an indirect-fire weapon. 25 degrees will be plenty.. Also, the measured height would include the cupola, which Tanksharp doesn't create. But this version is a little taller.

Vehicle Name US M-6 Heavy Tank
Vehicle Type tank (prototype)

Length 7.50 meters
Width 3.12 meters
Height 2.96 meters

Crew 6.00 men
Passengers 0.00 men

Weight Breakdown
Crew Weight 1.08 metric tons
Passenger Weight 0.00 metric tons
Miscellaneous Weight 0.13 metric tons
Armor Weight 37.73 metric tons
Armament Weight 3.82 metric tons
Ammunition Weight 2.05 metric tons
Engine Weight 1.74 metric tons
Fuel Weight 1.27 metric tons
APU Weight 0.00 metric tons
Energy Bank Weight 0.12 metric tons
Transmission Weight 2.50 metric tons
Amphibious Equipment Weight 0.00 metric tons
Suspension Weight 4.29 metric tons
Track Weight 4.48 metric tons
Road Wheel Weight 0.78 metric tons
Applique Armor Package A 0.00 metric tons
Applique Armor Package B 0.00 metric tons
Cargo Payload 0.00 metric tons

Mobility and Performance Breakdown

Engine 825.00 horsepower
Fuel Capacity 447.00 gallons
Maximum Hull Speed (water) 7.65 MPH

Baseline Upgraded (A) Upgraded (A+B)
Combat Weight 60.00 60.00 60.00 metric tons
Growth Capability (Transmission) 36.25 36.25 36.25 metric tons
Growth Capability (Suspension) 0.00 0.00 0.00 metric tons
Ground Pressure 14.99 14.99 14.99 PSI
Power/Weight Ratio 13.75 13.75 13.75 hp/metric ton
Top Speed 24.92 24.92 24.92 MPH
Operating Range 120.02 120.02 120.02 miles

Amphibious Performance Breakdown
Density of Vehicle 1.33 1.33 1.33 g/cm3
Vehicle Freeboard (Transiting) -3.15 -3.15 -3.15 meters
Vehicle Freeboard (Dropped In) -5.06 -5.06 -5.06 meters
Vehicle Draft (Transiting) 5.01 5.01 5.01 meters
Vehicle Draft (Dropped in) 6.92 6.92 6.92 meters
Water Speed #DIV/0! #DIV/0! #DIV/0! MPH
Operating Range In Water #DIV/0! #DIV/0! #DIV/0! miles

Armament Breakdown
Hull Turret
Rifle Calibre MGs 1.00 1.00
HMGs 0.00 0.00

Hull Turret Total
ATGMs 0.00 0.00 0.00 rounds stowed
Rifle Calibre 3,000.00 3,000.00 6,000.00 rounds stowed
HMG Calibre 0.00 0.00 0.00 rounds stowed

Calibre (mm) # in Hull # in Turret Rounds (hull) Rounds (Turret)
Cannon/Gun 1 152.00 0.00 1.00 0 36
Cannon/Gun 2 37.00 0.00 0.00 0 0

BASELINE PROTECTION LEVELS
KE (mm) HEAT (mm) KE Resistance HEAT Resistance
Front Hull Armor 91.13 91.13 Resistant to US 25mm Penetratable by Virtually Anything
Side Hull Armor 72.97 191.62 Resistant to 40mm L70 M56 AP Resistant to Bazooka
Rear Hull Armor 46.01 46.01 Resistant to 20x110mm Hispano Penetratable by Virtually Anything
Top Hull Armor 25.00 25.00 Resistant to 12.7 Penetratable by Virtually Anything
Hull Floor Armor 25.00 25.00 Resistant to 12.7 Penetratable by Virtually Anything

KE (mm) HEAT (mm) KE Resistance HEAT Resistance
Front Turret Armor 83.62 83.62 Resistant to US 25mm Penetratable by Virtually Anything
Side Turret Armor 83.00 83.00 Resistant to US 25mm Penetratable by Virtually Anything
Rear Turret Armor 83.00 83.00 Resistant to US 25mm Penetratable by Virtually Anything
Top Turret Armor 25.00 25.00 Resistant to 12.7 Penetratable by Virtually Anything