Heller isn' t " pathetic "...The GMC 's a nice kit, better detailled than the Tamiya 's one on some points ( nuts, engine...etc. ), and they 're a lot older, back to the 70s'...As most of their range !
The VAB needs work, as most of the kits, but it make a nice little thingy...Btw, the resin mafia 've made quite a few add-on, try Blast models, or Azimuth productions ( to name the french ones )
www.blast-models.com...You could find Azimuth VPC address in SteelMasters, the french magazine for AFV dudes !