Virtual Boy Wario Land ripping project, step one

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(Final program will most likely look nothing like that)

Reading tile by tile, 2bpp little endian. Offset for these is #8EF34 (your "common room elements" from 0x77821 are at #8CF34).

I plan on making an in-app preview of assembled sprites so you don't have to save them and open the result images externally since you're going to do a lot of trial and error matching.

About your banks, well, that, the bbhvbbbb is probably more of an uuhvubbb with u being whatever (zero ) and bb being another graphic index. The full graphics part is 128x1024 pixels, which makes 8 128x128 chunks with 256 tiles each. So if bbb is 002 as in your example, the tile offset is withing the third of these chunks.
I'll implement it that way and we'll see if it works, huh.