Yep My Four star is kit built. Very easy build , but I have yet to see a fast building kit some just take longer than others.
The 60 size would be a good match for either of your engines.
With a Saito 56 I had to move the battery back in the fuse and had to add a 1/4 oz to the tail to get it to balance. So you may want to choose your engine for balance reasons.
My wife likes the fact my planes keep me out of her hair, I make sure the honey do list is up to date and it`s good to go.