I may be interested in doing some conversions for you if you had some of those pieces apoc is talking about. Are you talking about like dreadnaught sized conversions?
This is a dread conversion i did for a deathguard army.
A plague toad i did for my deathguard army, this piece is big it's roughly the same size of a dreadnaught.
If your interested let me know I'd love to smash something together for you. Just need some trolls, mino's, maybe a couple plastic dreads and some Mk7 space marines.
Blind-
Edit: I am in the States, and i think some of those lesser demons apoc is talking about would be good for the conversions as well.