As a former Country Homes Camper owner, I know a few things about them...
They were all built on passenger vans.  No reinforcement of the roof was done in the conversion.
They certainly have their advantages, but overall the quality of the westfalia parts used are superior.  I found my top  (ABS plastic) started to crack at the stress points (hold downs)...and after this started, there was no going back.

You guys who are interested in this should check out this thread over on the Samba, where a guy whose passenger van got whacked by a tree decided to make it into a camper with a CHC top.  He documented the process pretty well, and in the end, did an awesome job.

http://www.thesamba.com/vw/forum/viewtopic.php?t=273404&highlight=country+homes