Oh, haha I didn't even realize you actually said the lab, I just assumed you were talking about the mansion
either way, I think the Mansion is a great idea
Also, I've said before that all the Red sprites are being replaced with the sprites from GSC, but there are a few exceptions. Like the sprites for Raticate, Zubat, Geodude, Gastly, Haunter, and Gengar are from Yellow, and Hitmonlee is using the frontsprite from the japanese Red and Green versions. These are just personal preferences.
EDIT: Ah, there's also the Yellow frontsprite for Scyther. I knew there was one I was forgetting