Hostel Shoppe still sells the Vuelta chainrings, up to 60T. That causes other problems however, in that there's a limited range that a front derailleur can reach across, unless you rig up compound gearing somehow (two rear deraillers like on the Rotator Pursuit, or using a Schlumph drive crankset).

There's no easy methods for making good full-fairings I've ever seen, particularly for a two-wheel bike. For an easy-to-implement (and safer) fairing, you could just go with a front Zipper or Mueller and a body sock kit.

With this combo, you may not be able to get up to 40mph on level ground but you'd hit it pretty easily down hills.
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