if you r unable to get a new one, look at the one u have. is it a single crack? you can crack stop it (drill a hole at the end of the crack) then but glue the peace's with formula 560 and a brace on the back side overlapping the crack by .125 in on both sides also attached with formula 560. then fill and sand out the outer surface and paint it. some times the crack stop and patch does not look that bad and I leave it that way.
https://www.towerhobbies.com/cgi-bin...&I=LXCX70&P=ML
brian taylor planes sells a canopy for their 60 in ws that may work.
FOCKE-WULF FW190 A-4 | Brian Taylor | RC Model | Scale Plan
Joe