Oh man that is beautiful! Nice work! I have experience with a Rolls saddle. Honestly in my opinion it is not as comfortable as a modern saddle. As far as old school saddles, personally i found the Turbo more comfortable. Some people are the other way around. They are very similar, just depends on the shape of your bum I should think. Judging by the setup of your bike in that picture it looks like you like to ride with a good amount of setback (so do I. yay for long femurs!!). If so you may find that the rails on a Rolls are too short. Modern saddles like SLR's etc have the rails biased further back and also the rails are longer so you can mess with your position more. When I had a Rolls I had it all the way back and I still wanted more setback. That was with a 74 degree seat tube, which is probably what you got. Again it depends on your preferences/bike geometry etc. Basically the bottom line is, a Rolls or similar old style saddle may limit your fit options. Looks pretty cool though If you are happy with the fit as is, with your current saddle I would just leave it. Looks cool actually!