Light vs. Clean : I agree with Hrolf, I like to know how my planes perform with fuel and ammo loaded, not in a light configuration. Hence my encyclopedia lists the 'clean' but rarely 'light' versions.
However it seems a number of planes I try match their real world counterparts a bit better in 'light', which would also be better for marketing.
Plane research : One of the annoying things about the B-135 is- despite the basically one model- there are different stats given.
I used this page
Avia B-135
for dimensions and most info. It's got the same light weight Vukovlad provided, but a different max.
Same range, higher speed.
Engine listed is odd- the 12Ycrs is usually listed in the 840 range, not the 860, but I went with the 860.
The fun part is Wiki's post lists 860 also.. but when you click through to the -crs page, that lists 848 at 4,000m. Argh.
Ceiling and Rate of climb were not listed, so I looked to wiki.
Wiki is which is .1 greater on climb than Vukovlad's source. Wiki is also closer on speed, but has severely reduced range. Considering that Vuk's and the link above both say 940km, that may be correct.