Some classic Ork bits and pieces there, heh those 2nd Ed plastic Gretchin get everywhere i have close to 50 myself and i didn't actively set out to get any lol.
As for a Battlewagon, i was lucky enough to get one from a member of this forum
I think Gretchen breed quickly.. I have over 100 plastic and near 200 metal and I do not remember buying more than 50 of the metals.. the plastics were left over from buying 2nd edition new but you did not get that many so no idea where the others came from..
Some nice orks you have there. I notice a few lack arms? Have you got enough spare? If not pm me I have bucket loads..