Are you sure you have a Kaymar, it sounds more like the Davis (?) one when you talk about sliding tubes and bolting it to the door.
The only Kaymar's I've seen on Defenders are the usual type with the latch on the rear of the chassis and not connected to the door at all.
A Kaymar carrier should swap straight on to your Puma, with posibly one small addition needed. The chassis on Td5's and Pumas 'dips' in at the ends, so you might need a 5-6mm spacer between the chassis and carrier so the carrier bracket doesn't hit the bottom edge of the body panel, but having said that, I reckon there's a good chance it will bolt straight on without a spacer because I think the top of the Kaymar bracket sits lower than the top of the chassis (unlike other brand carriers which make use of the stronger parts of the chassis 


 )
The beauty of Defenders is it's easy to get to the chassis where all these things bolt on, so just try it and see.
If you intend to use your car for 'serious' travel, for example, driving on corrugated outback roads for many hundreds of kms, the weight of a wheel and tyre on the back door hinges and catch is a lot to bare.  The older aluminium skinned doors still had a steel inner frame and commonly cracked.
Fitting a wheel carrier also gives you the option of fitting other accessories to it, such as a Hi-Lift jack, shovel holder, etc etc, which you wouldn't add to a door mounted spare.
Cheers, Murray
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