Back window does not open .....Not knowing how close handle for blower comes to the rear of tractor .... you could unsnap the right or left side or cut an area where you could reach back to turn the handle or extend the handle through the hole you had cut.
I had a Golf Cart heater in front corner of cab on the right side next to window.
heater came with a holder that fit in a cup holder I put a strap around the holder that came with heater and attached the ends to upright post holding the cab..
The bottom of cover on back of cab is fastened by velcro strip
Just a few photos of my 2305, Amish made trailer, Original tractor cab,with my way of keeping warm, and new cutting edge of 54 JD Blade.
Sorry for so many photos but needed to show the upgrade of cutting edge, the original one was worn out after 2 years. Then I wanted to show how I keep warm with little cost. Yes I do run chains in winter because of slope of driveway and not wanting to replace garage doors plus plowing snow down beside house.
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Hope this helps on heater location.. This year I added a regular heater from a Veratrac and mounted it in the left side of cab and still left the holder in the right side. Still holds 1 or 2 bottles of water holds gloves, muffs,pliers, just misc items.
when I put the heater in this year with the radiator hoses I cut the cab just below the slit in front ,then put some snaps on the cover and spare piece of cover that came with cover.
Good luck, be safe