Removed my aluminum frame with a heat gun.(all screws out of course) You have to soften the adhesive. Frames will probably be bent in spots. Work slowly. I tried to work slowly and still pried indents in frames. Thru them out, cut biger holes, plumbed the area more vertical for drainage, learned how to epoxy, faired to shape with existing curve of cabin top, installed 4 new beckson 17X7 inch opening ports. Fairing to perfect was tough for a first timer. glass was over 1/4 inch ply. Looks great, changed the look of MKII for the better I think and I have air in cabin. Boat was refit completely and painted and is for sale at www.boattraders.com if you want to see windows. good luck