Fairclough is the way to go
I started by making frames and covers that never did fit right and cover the boat properly or failed under heavy snow.
Finally purchased a Fairclough, full frame, mast in, 2 piece, full cover - covers entire boat down to the water line. Besides my below deck Autopilot it is the best purchase I've made. Fits perfectly, has a zippered access door and vents. I keep the cabin doors off the entire winter, no snow, no moisture or mold. Cover up in November - no worries the entire winter. Takes four hours to install alone, half that coming off. Purchase off season for a generous discount.
Sabre 30 cover cost was $2800 including delivery.
Go for it - you won't be sorry.