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If you are looking at the "build-your-own" on Freeserve, one of the key bits in the plan are the PVC cross pieces that help form the spine. Although the writer says they are out of production, something that looks similar is listed on lbsgardenwarehouse.co.uk (four-way tee listed in three sizes). I have spent ages looking for a cross piece and its the only one I have found so far. I don't know if it will work, but it looks a possibility.
I seem to remeber a home made poly tunnel somewhere else on the allotment web ring, He udes some 3" square posts with the Water piping over the top. that way you could have more headroom at the sides. I'll go a googling and see what I find....
ntg
Never be afraid to try something new.
Remember that a lone amateur built the Ark.
A large group of professionals built the Titanic
Here is a piccy of my homemade polytunnel taken when building the raised beds. the sides are straight up to 5ft then curve. this allows full use of the width as no room is lost where the tunnel curves. The pipe is slid over 8ft lengths of scaffold pipe knocked in 3ft.
I have added a 20mm conduit strenghener through the very top of the pipe to stiffen things up just like on a bought polytunnel. The structure is immensely strong and has cost just �95 for the cover with the rest salvage.
the piping isnt too expensive to buy new compared with the cost of a new tunnel. Mine was salvaged from work. I work in a quarry and we use it to shift water around but you may well find some on building sites if you ask.
Emma
I work for a drainage contractor and we have loads of it lying about the yard - you might want to try any similar type of contractors in your area - or even contact your local water authority - if you tell them what you're after, they might see fit to put you in touch with whatever subbies (sub contractors) they use to renew or repair water mains - you may be able to source some that way.
Good luck
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