Hey! thank you all! I like you like it!
Answering your questions, main body comes from two different models: Magmadroth from GW and Gran Demonio from Mom Miniatures. You can see both below.
But giant bits were specially important: for the head and for hands.
There is also some bits from other models: old skeleton shields, part a chariot of chaos structure, bits from chaos infantry, from ogres, from juggernauts, some parts of the armour are made from plasticard, and finally a lot of green stuff.