Doable, but personally I would use something nearer in terms of size to begin with, like a pulsar one, the YB is a very long engine compared to a 206GTI engine.

all you need to do for a pulsar one is buy a pulsar plenum, but a throttle body manifold including the injector boss, buy some spacers, make a mounting plate (or buy one from Neil Adams on Vaxusport) make a spacer plate (or buy one from Neil) and thats it done.

Same way I did my nova inlet using an RS200 plenum.

If you wise then you can use TBs instead of spacers, and end up with a multi throttle setup.

Mine cost me about 800 all in, its a few hundred more if you decide to go multi throttle.