I'm thinking, if i can accomplish, I'd like to make a "zelda-Ecco the dolphin" combo hybrid

that is, make zelda style'ed ecco themed game

what I'm looking to ask for, is the super overkill tileset making
sprite replacement. I'm told you can make multiple maps.
(well, zbuild needs to load first, launcher can do that right?)

is this possible? what are limitations? right now I'm only trying to play the zelda2 remake. so I'm not playing anything right now that can show me, to what extent I can replace sprites. how to import, and a proper way to make a sheet.

http://www.purezc.com/forums/index.php?showtopic=37395
player cannot be any longer than this? or the mechanics will be confusing?