The wire frame is a preformed set of wire landing gear for the Ziroli that cost a lot of money. They can be made by hand they are just a little more difficult to bend and weld than most simple wire gear. As far as the cost thing goes the retracts do run about as much as the kit but usually that is about a fourth or fifth of the project cost. You have the kit, retracts, engine (or engines), servos, and on last few I have done there have been optical isolators, power distribution system, batery backup system, fiberglass, paint at $40 a quart, tires, wheels, brakes, cockpit kit, all in all most of the giants I have done have been around $2000 a piece and I don't really consider them contest ready. Not wanting to discourage you because looking at your finished project is a great thing. Just be prepared for it not to be cheap. Good Luck with your project and If I can be of any help just pm me.