It comes out of said case significantly easier than it goes in.
The first step is the pop-up..stand back !
One of the critters shows an interest, always on the lookout for a new napping spot.
The next step involves getting inside and putting in the roof support pole. One tries to perform this activity when the neighbors are not looking out their kitchen windows. Lucy Ricardo comes to mind.
Successful installation of both the roof pole and one of the pairs of side poles is complete.
Two or three of these seedling mats provide my heating system , only to be plugged in when overnight temps are predicted to drop into the 30's or 20's. Still longing for a 'real' greenhouse though..this will have to do for the present.