Let me suggest the following:

Wings- use 1/32" sheeting maybe 5-6 lb density. Taper sand the tips to thinner than 1/32". Shoot for a weight of5-6 ounces for a 300 square inch wing
Ribs look awide to me which will result in a thicker section than the original wings in 60 size. Shoot for about 12-14% section
Thin walled 1/8" carbon tubing as spars and 1/4" LE should shed more weight; albeit more costly.

Fuselage- . I'd use 3/32" medium balsa (8-10 lb density) as sides and double the front.. I'd use 1/32" for top and bottom. Some 1/8" thin walled carbon tubes possibly as longerons. Fuse plusfinweight should not be more than about8-10.. ounces

75 square inch stab shouldn't weigh more than 1-1 1/2ounces

Empty weight should come in at about 1 1/2 lbs +/-. Flying weight should be around 2 1/2# for better flying with a 300 square inch wing