Learn how to build yourself a hydroplane boat in your backyard. our complete boat plans collection is available for free and immediate download. it is the largest. Our boat trailer plans feature the most modern, up-to-date, and technologically advanced features available to give you a boat trailer that’s equal or superior. Didi mg30 built by tamas csaba in hungary . our stock design file . click on design links below to see more info. go to pricelist for plans & study packs.