At last, a question I actually have knoweldge about! Firstly versace, do you know someone who can erect scaffold - it sure is heavy stuff when it falls on your head. I'd hate to see HSE swarming around your plot stomping on your seeds! What surface is it going to be based on, are you going to cement the tubes in or have it as a free-standing structure. Let me know and I can give you a list of the scaffolding plant you will need. Whereabouts do you live - if you live anywhere I have a plant supplier I may be able to get you a discount - big buyers pay around 1p per foot for tube - but you'll probably get stung if you are buying retail.