Well finally after 35 years of coveting I finally have a camper

A nice and tidy Komet with LPG conversion which is perfect for our little family....with one exception, no heating!! My better half specifically specified heating...doh!!
I've decided on a Propex unit but where is the best place to order? I see Just Kampers and VW heritage offer kits but can anyone advise which is the best of the two (or any others) to go for in order for a nice easy self install?
Thanks folks