As i said i did not buildthis particular modle but scrach building is relativly easy thin ply for the decks and balsa spars i have had a word wiht Mark and hes a bit busy at the moment to build you one if you wnat to scrath build a Model hover theres diffent ways of doing it theres the Griffon 200 TDX the plans are free form
http://www.model-hovercraft.com/2000tdx/2000tdx.html it a nice caft to build and i have built one as have mant other people so threes lots of info on the web about them or thres the Grifin600 model avalibe from
http://www.modelhovercraft.co.uk/index.php?q=65.html or the SRN6 plan avalible from traplet publications for a firts scrachbuild i would go for the griffon 2000 than you can build sometihng that looks like this