I think you should do the bathroom a lot different if wheelchair access is contemplated.
1) The lav sink should not be a cabinet. It should be a wheelchair accessible wall hung, not a cheapie, but like this>> http://www.americanstandard-us.com/p...ol=&prodID=107
2) Although you do not need to comply "officially" with ADA specs, that toilet is not wheelchair friendly. I think the wall-to-wall distance needs to be 42"
3) I don't think a corner diagonal shower is very wheelchair friendly. I would do a custom roll-in floor, with the entire bathroom floor tiled.