Im on with my doors now, nearly finished the build. After the hatch I found these to be the most daunting initially.
They have been hard but its my design fault, not the general door itself.
I went for this style door (not my td), but I made the bottom edge curved which has gave me a headache with UK T molding as its a bugger to bend round without snapping. (The general door curve was easy however) I have trimmed (leaded?) the edges however and it now fits.

(pic courtesy of Vintage Technologies)
Instead of the above, I did more of a curve at the bottom lock end like this

Whilst I think this looks nicer, its not worth the extra effort!
That aside, it still only took an hour to do the molding for 1 door, and im doing the other side tonight. If I had done the door like in the pic, without a bottom tight radius it would have been very easy.
I just put a plywood blank against my door opening with all the molding to the door frame fitted, drew round it with a pencil from inside, then jigsawed out and sanded to get the gaps right. (1/8 ply scraps are great to prop it in the gaps)
My doors in 3/4 ply plus window/alu/locks and trim probs cost about £50 each. (window being half the cost) If id bought the doors theyd be hundreds. Square doors dont look right on a teardrop anyway.
Im glad I did my own