Very nice work. I've tested import player and it works. its just that when you have to insert a cd to boot, it freezes. I think it's due to the cd rom not being mounted. If the cd rom would be mounted, maybe it could launch psx cd's from the cdrom.
I've also tested DOOM, it freezes at the loading menu. It has a doom.exe inside the img file, how could use the -exepath= to point to the right path?