Can't remember how easy they are to remove, but should be fairly easy as he designed them so you can get the hardtop off & raise & lower the softtop.
Sharpwrax is a member here & before he started designing it as he couldn't find any others that did what he wanted.
I think he originally set it up to be hinged at the rear so you could unclip at the front & tilt it to raise & lower the softtop or to remove the hardtop.
No idea on prices offhand, though.