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I believe that's photographed with the crank bolt 'finger tight'; we know that when properly torqued, there's less clearance than that.
There's evidence (online) that SG75 BB spindles are 0.5mm longer than Hattas, but =0.25mm, while nice, is not going to make sod all difference; under load, the crank spider will still flex and rub.Stalling tactics and maybe hinting you should buy a SG75 BB from them.
(Incidentally, PM me if you do want an SG75 BB - I have mint one [indoor track use only, standard SG75 w/mirror polished races, unused original bearings and ceramic balls, so can effectively run as top 'Super Lap Ceramic' spec.])
Are the SG75 cranks you tried yours to build with, or borrowed? I genuinely think a Campag Centaur 111mm BB would help you out if you commit to Sugino cranks.
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Lukas
Dolan finally got back to me, and they now believe me using Hatta BB could be causing the SG75 to not fit. They suggest using the Sugino standard BB which I of course don't have.
Got this photo from them showing a SG75 with matching BB.
Does the Hatta BB really give a narrower chainline and will swapping BB solve everything?