Yes many of us use windows for the fronts of cages. I also have some that are glass in a slider track IMO those suck. My monitors always seem to figure out how to jam them up on me.
I also have some swing out doors and some lift up or down doors. But they don't work well with all monitors. Especially the ones that sit waiting for you to swing it open and bolt out around you. haha
Monitors by nature are not picky eaters they are opertunistic. So if yours is being picky then it probly means there is something up with husbandry. This could mean the cage itself and care. Or how the food is offered etc..
You can try not offering him the ground turkey then see if he takes the mouse. Be patient and wait it out. Don't starve him but go a few days without the turkey. This has worked in some cases I know of. Yes if offering ground turkey you need to suppliment. Same goes for insects.