That looks great Glenn!
I had a similar worry about the Shimano claw that came with the Raleigh. I guess I could always mill something up myself that works. I'm a madman with a chunk of steel, a hacksaw, a drillpress and some files. I can make anything flat like that with some time. When done just keep sanding it down with finer and finer sandpaper until it is baby-smooth and paint with High-temp Duplicolor paint and bake in the oven for 6-8 hours at about 400-degrees. This makes for an almost factory finish on steel or aluminum. The end product is similar in feel and toughness to that found on military rifle parts.
Those brakes looks really sweet. I know that after I get a nicer set of cranks than the junk cranks that came on the Raleigh the next thing to start looking for are better brakes than the single-pivot DiaComps. They will work but better is better. Maybe something will show up at a swap or something for a decent price.
Then it will be a waiting game to keep an eye out for an even better frame than the entry-level 502 Raleigh. I'm not married to it but it's just a scaffolding to hold the groupset I'm building up. As long as it fits and it is an upgrade and is a bargain I can always jump. Swapping components isn't much more work than getting dressed in the morning