in the future for a redtall 6x2 im talkin when hes 9 to 11 feet fulll grown but untill then you can keep him a 4x2 untill hes about 7- 7.5' . materials. im a fan of 1/2 Birch and useing popular wood to make door and door frams out of. cost for a 6x2 they way i would make it would be ruffly 150-200 bucks. when glued and clamped tightly with a screw here and there or nailed with finishing nails (which i just use my nail gun)
how big is your boa????