It sounds like the rear is the same size as the front. It's not terribly hard, I'd say go for it!!! It will look very nice without the locks in the front doors.
I would strongly suggest that sometime in the near future after you do this, to get a battery backup with a switch hooked up. My suggestion for this (A friend of mine's dad had this on his 55 Chevy).
Normal battery with keyless entry as main system.
Backup battery with switch as secondary system.
I think it was some sort of voltage regulated relay? Basically, if/when the main battery died, the relay would change over to the battery with power so you can always open the doors. The only time I ever saw this was when he disconnected the main battery, as far as I know he never had a dead battery but the backup system was there just in case.
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