So I finally got round to completing them ready for a game on Monday.
... "But, you said you only had one box of Tank Killers, there's only 5 in that box and you have 10 tanks there!!!"
Yes this true, but I have cheated a bit. With the battlefront plastics there's actually almost a complete upper half for each tank. With just the exhausts needing to be added extra. Those I moulded using Instant Mold and Green Stuff.
With the addition of some magnets I now have interchangeable upper hulls meaning I can make up 5 SU85s or 5 SU100s as required.
And some closer shots.