I used regular entry locksets...and my doors were only 1/2" plywood. I added trim( just added a fun and simple design to both the front and rear sides, bought a nifty tool,
and wa lah........
everything turned out great.
A look at lockset tool..........$11.95 from HD:
Inside view:
Outside view:
(that's Bill hard at work on second door as seen through completed door).
Barb