First frelling off, a Lego Final Fantasy 7 would be in the same 'open area' style of Final Fantasies 11 & 12.

Second, yes, the abilities may be connected to the various 'parts' of the characters. Or rather.. the ability to learn a ability could be connected to a 'part' or 'parts', possibly a 'la Materia.

Oh.. and materia would be little lego pieces you put on 'connection points'* on the weapon or connected to eachother to a single point. (Like say... a single 'connection point'* on the end of a sword's hilt.

So really, kinda fun to discuss theoritical games. A regular Lego Final Fantasy (disconnected from previous games, perhaps it's own series) would be much more fun (IMO) than the billboard for a bloated corporation called Kingdom Hearts.

(* those nubs you connect a flat lego small piece to.)