The Excelsior probably went 9.4 or something like that with it's transwarp engines, probably of had the warp scales readjusted for it, since Scott removed the chips I don't know if transwarp was done or not, truth is, I think Transwarp was still being used, just that in ST:III it was offline, The Excelsior Transwarp engines probably are pre-tech for the Galaxy Class engines. After you're done with this Set I think we should figure out what a Transwarp Constitution class ship would be like.