Have you considered Mods? WorldEdit-Forge (and I think McEdit, not proficient with that one) allow you to create a snapshot of your completed creation. You can then paste it anywhere on any world you please.
WE also allows you to change the biome if you desire. Please understand changing the biome only changes the weather and any mobs that frequent it (blocks already created will not change).
My home consists of a 62 (NS) x 63 (EW) hole dug down to Y=46. The surrounding blocks above and around are water (Y=63 to Y=47).