Update.
I sold my van back to the dealer i bought it from. Not what i wanted, but i hadn't had a serious offer from public marketplace.
Been today and picked up the VW Transporter. Same place i met a couple of hundred angry wasps... so that's twice i got stung today... Boom Boom!
Its ply lined, floor and walls. with plastic bulkhead between cab and rear space. Plastic trim on roof, so not possible to fix anything like a stepladder bracket to the inside of the roof.
Will just have to build a shelving unit ad hoc as i need it.
Looking online for a roof bar system just now. Ebay has a 2 or 3 bar product from "Ultibar" which looks ok. Has the slot along the top to fix down my pipe tube.
Find many great new & used options and get the best deals for Vanguard 3x Ulti Roof Bars for VW TRANSPORTER T5 2002 - 2015 H1 L2 at the best online prices at eBay! Free delivery for many products!
www.ebay.co.uk