Ill will try to answer your point from my personal experence with polypro.

The density is typicaly slightly lower than polycarb so that should not be a problem.

To a limited extent, it is softer to polycarb making it less likley to crack and simpler to bend.

As far as I know it has no adverse effects on radio over polycarb

no

Personaly I have found it difficult to cut with a jigsaw as it tends to build up swarf on the blade but its very easy to work with wood tools.

Sam