I built my first recumbent from a Rans Enduro Sport frameset. I bought the frameset through Hostel Shoppe who had it drop shipped to me directly from Rans in Hays, Kansas.
The frameset included frame, fork, seat, handlebar and riser. I can't remember if the headset was included or not. I didn't want the handlebar that came with the set but it turned out to be cheaper to buy buy another bar than to get them to swap out the kit to what I wanted.
I had a good amount of experience working and building bikes but had never built or even examined very closely a recumbent before. Even so, it took me a while to figure out a few things, like brake cable routing. Overall, I have been well pleased with the overall experience. If you're looking to save money this probably isn't it. I had a good stash of parts like Chris King hubs and XTR derailleurs to draw from but all the little detail things (I have Paul thumb shifter mounts and a few Terricycle parts) can definitely run the cost up. To me, however, it was worth it to build my own bike making all my own component compromises.
I would definitely do it again but, if I did, I'd spend the extra money and start with a Ti-Rex frameset for a little added bling.
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My greatest fear is all of my kids standing around my coffin and talking about "how sensible" dad was.