Here's a little info for all you DIY folks out there. I found a company that sells electric kits for bikes that also sells recumbent trikes. The company Cyclone-TW sells a 27 speed disk brake recumbent trike starting at 599 dollars. They also have a "tilting" recumbent for around 1700. This could be a good start for a low cost DIY velomobile. Here are some pics I found from their website.
The trike pictured to the right is a tilting recumbent trike. While the one pictured below is a standard recumbent. Both trikes can be fitted with electric assist with many different power settings. They might not be the big name brands, but for those of us on a budget, this could be a good way to get started.