Does anybody here have a series 5 with a series 7 firewall forward, or know of anyone?

Was wondering if anything different has do be done during the installation/ build, or if the fuselage upfront is virtually identical? (ex: all hole provisions are there, and members are in same spot)

Also wondering about CG and W&B. I know the series 7 has the engine further out front than the 5, but now that I think about it, even the 7 does not require the forward sweep until you use an engine heavier than the 912.