I doubt if modern brakes will work on this, i had similiar cross trophy and brakes was pain in the ass, old ones have 55mm between the brake bosses and moderns have 80mm so there might be problem to fit those new brakes.
How's that? You can almost completely adjust them, there are spacers on the blocks and you can adjust the brakes a lot, don't think there will be a problem cause in that case the same problem would be there with fitting modern canti's on these kind of frames.
Yes canti's have same problem, atleast me and few other guys who have built vintage crossers, modern canti's you can mod with bendig the spirng, i don't know if it works with v-brakes.
I've never had any problems setting up Canti's or V-brakes, and I've done quite some. So I don't think this will give me any problems, but we'll see!
i used modern canti's on my vintage Orrell crosser but had to use ThinStop pads which are, as the name suggests, much slimmer and allow you to adjust them properly. Also very good at stopping.
The mounts on mine were the same as more modern ones also, and I was using frogglegs, it was a distance thing between the mounts that was the problem-slamming the pads all the way back into them meant that I couldn't get decent contact or toe-in properly. Hence having the choice of different brakes or slim-profile pads.
Hope yours will work out though, looks like a really fun ride.
I had the same problem on my vintage cx bike. Had Frogglegs and they fitted, (barely on the front, fine on the back), but they were terrible at stopping in the wet, even with salmon Kool Stops. The pads barely had enough clearance to clear the rim when fully open because the back would hit the fork legs. I ended up getting Tektro 720's and slimline Kool Stop pads. So much better in all conditions.
I had the same problem on my vintage cx bike. Had Frogglegs and they fitted, (barely on the front, fine on the back), but they were terrible at stopping in the wet, even with salmon Kool Stops. The pads barely had enough clearance to clear the rim when fully open because the back would hit the fork legs. I ended up getting Tektro 720's and slimline Kool Stop pads. So much better in all conditions.