Definitely get the IDC connectors, even if you have to
mail order them.
Soldering 50 conductor ribbon cable is not my idea of fun.
Another tip ; If, as here, you're making a cable with swapped-round
connections, get the 'rainbow' multi-coloured cable, not the grey stuff.
Being able to recognise wire 15 (it's the second green one) rather than
counting, and probalby miscounting, for each one, is well worth the extra
cost of the rainbow cable.
-tony