Actually one of the 3 windows is an egress window. I have 3 windows in my basement, two on the left wall, and one on the front wall. I want to block them but I know by code I need to keep the egress window unblocked. Also, I will be treating all walls and covering them with GOM as well, so that should hide any imperfections with the window cover.
So I am thinking of doing one of two things, either coming up with some kind of temporary or removable window panel using drywall and 2x4's (sort of like ChinaDog "Bud" did on his winows) but instead use hinges on one side and a simple slide/mechanism on the other side) this way it says in place.
The other option which is what ChinaDog "Bud" did, which is to make this drywall/stud panel and tape/mud it shut, but I would need to schedule for the final inspection prior to doing so, wait until they leave, and tape/mud the drywall/stud panels.