Spilou,
I both buy and build my own Ryvs. You can make one a lot better than you can buy it, but in the USA they are so cheap you can't make one for the retail price (if you shop around or jump on a sale price)
The ones I build will fly indoors or in a 20 mph breeze, you only change out the leading edge. I make the center vee 12 inches deep instead of 9 and I lengthen the sail height to 32-1/2 inches on the down tubes, dump the leading edge venting entirely if you want great low wind versatility. I use skyshark tubes for the down spars (tapered) and the SLE revolution tube in the leading edge, unless it's no wind conditions again.
With the increased surface area and all the mass located at the leading edge, you can throw and catch the thing on long lines or effortlessly up to about fifty feet in length.
You don't have to sew either! As a matter of fact I prefer the no-sew technique, as it is stronger and also lighter in weight. With sewing you have to perforate the material, no-sew you just fold it over the top of double faced adhesive (3M's 9460 is designed to bond metals!), then you heat it with a iron and it's absolutely permanent.
I have kites that are still being flown w/ 1,500 hours on them, made entirely in no-sew method.
I replace the bridles and cover the knots with little sheaths of fabric on the stock models, otherwise you'll occasionally catch a bungie washer/knot on the back throwing it around.
I also prefer my quads with "magix stixs" on the back of the frame, this adds strength, prevents bowties, allows the kite to stand-up inverted on the ground and doesn't add enough weight to dramatically impact the flight dynamics, even indoors. For years we laughed at folks using this device on their kites, we called 'em "training wheels!". Now I feel the benefits outweigh the ridicule associated with their use, HA!
You can buy and modify a Revolution kite, or you can borrow one and make your own. Rev end-caps and the SLE tubes are simply without equal though. You should consider any alternatives very carefully before dropping your money on the table.
I as well as every other builder I know wouldn't be willing to send you plans specifically, but we'd be willing to offer you assistance. I recommend icarex polycarbonate or ventex polyester as you choice for fabric, some areas need kevlar and dacron reinforcements also. The entire kite can be constructed without ever touching a sewing machine.
I purchased two stock REV 1.5s within the past year, but the ones I turn to when the money's on the table are all homebuilts. Trust me the ryv is easy to make, it's all straight lines and a flat surface area. The master of innovative design concepts is Harold Ames. He can offer insights that make doing it yourself worth the trouble and expense. We did a cooperative effort for the Smithsonian Festival back in 1999 and it was one of the highlights of my brief kite career.
Send me a personal email and I'll provide it to him for a response, but I'm out of the office for Nationals after thursday the 22nd of September until the 4th of October.
-paul
maryland, usa
PS: Don't think a REV, even at europe's exchange rates, isn't worth the money. They are a lifetime of pleasure for a few hundred dollars (the cost of building one yourself). Personally I flew them almost exclusively for seven years before attempting to compete or modify the design. There must be 40 or more of them around my residence now, from litttle tiny ones to ones that can drag you effortlessly across the sand. Revolution is a fantastic company that deserves your support, if not now as a student then later on when you have more disposable income.