I saw this on ebay
Land Rover Defender 110 Galvanised Chassis Supplied and Fitted | eBay

Anyone hear anything about them, I have seen some positive reviews on remapping but nothing on Chassis swap.

Viezu Tuning International HQ Reviews | Read Customer Service Reviews of www.viezu.com (trustpilot.com)

VIEZU

Local to me, good reputation for quality work - have tended to be more high end refurb/bespoke customer projects - but absolutely know what they are doing. No first hand experience of their service except buying some bits over the Years, but are an established business run by enthusiasts.