I've had several Four Stars and they are great airplanes.

If you can find an aluminum landing gear you like, it can be installed on the Phoenix Dolphin with a minimum of trouble.

I use a 1/4" maple doubler on the inside with bass wood triangle stock on the ends of the doubler. If the fuselage bottom is not hardwood where the gear fastens, cheek plate it with some thin maple plywood.

I like to retain the gear with the plastic 1/4-20 wing bolts. I use four of them and they are threaded right into the bare plywood. I put thin CA over the threads and retap. The gear will break the bolts and shear off without damaging the bottom of the model.