What's the spacing on your loops, center rail to center rail?
Are you using 048 & 036 curves?
The switches are the same price in FasTrack. I agree with RickO. Go larger. You can always use them when you grow to a larger layout.
Yup. The larger switch setup would occupy a side, but you could put all four on one side.
Attached is the 072 switch setup from the FasTrack modular plans. Keeps a 6" spacing.
The 036's will probably be easier to fit.