Mike, That's the way they are made. My pics may accentuate it. The curve is necessary to get from the back wheel, under the seat and up to the pedals. The tubing is heat treated after the welding/bending process. It's comfortable. I adjusted the seatback down a bit, and it's like sitting in a lawn chair. Where I live is pretty scenic, and with the trike, I don't have to stop and park the bike to take a picture. I just stop, relax, and shoot. One observation, I have one leg that's a couple of inches shorter than the other (a rather uncoordinated, but highly spectacular motorcycle dismount), and though it never made a difference on a conventional bike, it makes a difference for adjusting pedal distance on this.
Okay, here's the parts for the trike. I will have to have some things fabricated, but this is most of it.
Anybody got a shoehorn?

Gratuitous scenic picture. Sagway is up in that right-hand inlet.