I've been running this setup on my 48 cub for several years now:
I originally made a full set of side curtains that also attach to the hood front to back, but I haven't needed them. The temp is perfect inside without them. If it was any warmer inside, I'd have to shed some clothes.
One time I noticed the cub getting hotter than usual and when I hopped off to investigate, I noticed the front flaps had come unhooked and closed completely.