re T-70, SU-76M
Henk Of Holland has pictures of both these built from the UM kits, sprues and instructions.
Also has the T-80 and closed in variant of the SU-76
And there are links to reviews of both to the OTW site.
I have the T-70 unbuilt, appears to be usual UM standard of fairly crisp casting, & little flash. I've found most UM kits have few fit issues. They area also well priced, and stocked by many reliable online retailers.