I have been reversing the hang of a typical hardboard panelled grained
internal door.

After changing the hinges over I found that the door had been cut to suit a
rather out of square frame so I need to consider putting the hinges on the
catch side and filling the holes as best I can.

The trouble is, I think there isn't the same reinforcement for the catch
mechanism on the opposite edge of the door.

Any ideas? Getting a new door appeals - but I lack the decent tools to trim
it to fit.