when I upgraded my H-9 Mustang Marie with electric retracts I removed the plastic wells and made balsa gear bays.

if you soak some 1/16 balsa with a alcohol and water mix it will soften the wood so you can bend it, I used a tape roll to hold it then after the wood dry's you need to fit it into the wing,it takes some time but the end result is much nicer than the plastic parts

it takes some fitting and thought when your placing the wells into the wing to make sure the walls are vertical and not angled, but a little trial and error and you can pull it off.