A few years back I bought a set of Bill Stewart recurve limbs off an auction site for this purpose. Though i had one years earlier, I didn't have a clue to limb pocket angles etc., so I found another auction selling the entire bow with several great close-up pics of the riser.
Printed out the riser and kept enlarging the pics until they measured the length I was trying to obtain (17" I think....had to glue several pages together). Traced this onto some dyamondwood and the rest was history.
Oh - getting the limbs mounted exactly so the string was dead down the center was a bit challenging, but I think I made the limb pin holes in the riser a bit larger than I need, mixed up some short haired fiberglass and stuffed it down the holes, installed the pins and then mounted the limbs, clamped them onto riser, strung it and tweaked limbs left or right to obtain a perfect centerline.
Half-hour later I was shooting it in the shop. Was lots of fun. Tiller came out at a perfect 1/8+.