There are some here that would say you'd get more fun out of it that way than as a tent or teepee
If you come close to the official measurements, you might not get overpowered too easily. If you have constant light winds and heavy crew, you can add 6"-12" to various measurements and probably still use the standard attachment point above the forestay.
The cloth should be light enough so that it can be handled by a regular sowing machine. I don't know where you'd go to get instructions (on hems, cringles and shaping, but the problem is in principle not different for many small boats, so you might find a usable reference that's not specific to the DS.
For a home made pole, my recommendation is bamboo (if you have a good source, and have epoxy/glass for a thin outer layer). I think I described that above somewhere. The epoxy and glass for mine were minuscule amounts (from "stock" so to speak) and the pole was only $5.00. Try that with aluminum
Let us know if you find suitable info.