You can get track ends for 953 frames. 953 saves a big chunk of weight over cr-mo if you go to the right builder and use the right tubes.
It depends on how stiff you want the frame, but as a guide 953 can be up to a pound lighter than a similar stiffness cr-mo frame, and of a similar weight to a ti frame if that ti frames not a noodly-light one.
Brazing will add weight and only a few builders can TIG 953 – it’s a good indication of builder skill as it’s not easy. Plenty of places in Taiwan can TIG titanium, very few can TIG 953 (I only know one that’s really good and that’s due to their extensive ti experience, and one other that’s getting good)
I had a custom butted ti frame that was 2.75lbs for a 58cm-equivalent compact – too flexy, didn’t like it much. Had another at 3.4lbs that was PG – much nicer all round. I’ve ridden a 953 frame with same basic layout that was around 3.5lbs and it was the nicest of the 3. The 953 was stiff, but had the steel spring and comfort that I’d expect from a whippier cr-mo frame. It was a really nice balance, certainly the nicest road bike I’ve spent high-mileage kind of time on. It’s very hard to put into words or quantify with ‘stiffness-tech’, but good steel like that simply feels more like a coiled spring to me, ti can have the same spring / cpomfort / flex to it but it’s like a rubber-coated, kind of muted, slower rebound spring (??) – it feels softer or something like that.. High quality steel and high pressure road tyres are a lovely combo imo.
So Ti’s nice, but top-end steel can be just as good yet it’s rare since most of us go to ti at those prices. If I was pushed on this, for a custom road bike I think I’d go for UK made 953 over a US-sourced Ti bike, for VFM as well as UK-made reasons. The bike that I most wanted to ride home from last year’s Bristol Bespoke show was the Rourke 953.