Hi Marko
the G1V2 is actually turning into V3, and I suppose TT is already selling the G1V1.3. there is some major improvement between V1.3 and V2 and some fine tuning for the V2.2 that should be almost the "final version" of G1.
the V2 is recent then I suppose noboby already published a layout for it. but this is the goal of our comunity : sharing information about tube amp and developping projects.
here is the schematic of the V2.2 (part numbers are still missing and the part list will come later)
http://webschem.free.fr/z3pooqnh.png
that would be a great experience for you and a nice contribution fo the community if you try to translate the V2.2 schematic into PTP wiring diagram. of course you can split the schematic into smaller groups (PSU, preamp, power amp) and we will help you, check if it's right...
There will be a PCB for G1V2.2 (but not included in the TT kit) and it will be publised soon in the "projets et outils" section
I dont know much about legent 875 but I recently get a legend 105 and I am pretty happy with it. It has a tight bass like a standard 12", sweet high for saturated sound. the overall response is pretty close to the V30 (and family : raging cajun, and governor). it is a good compromise for warm clean and saturated tones (but maybe only OK for over drive)