the Arregui tubular carrier is of course a replica of the Vittoria Fulmine (lightning/thunderbolt)
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one small item you might wish to fit are the Arregui lever covers, Ref. 18; these are a good fit on both the shift levers and quick release levers -
the waffle pattern shown above is "late" type and came into use in 1972
the "early" type, employed through 1971 is of this pattern -
something on the order of six or eight colours were produced
one classy one is translucent amber
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lovely saddle & pillar you have mounted on there for the mockup!
if you wished to get cute you could fit a Tron et Berthet I-serie saddle and mount it with the special Zeus clamp parts -
as shown on the above catalogue page there is also the Zeus allen key seat binder bolt Ref. 55
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brake reach note -
have seen cases where enthusiasts have fabricated their own adaptor/drop bolts to solve such problems
one way you might wish to think about would be to adapt an off-the-shelf drop bolt intended for sidepull brakes
the standard drop on these is about 6mm which would be perfect for your needs - would put you right in the centre of the adjustment slot for the pad placement