If I remember correctly the bore should be 38mm or something like that. A local machinist can easily mill a larger bore in any sawblade so the bore should not be a problem.
At the moment the saw is still not in use. I haven't had budget enough for blades and electrical wiring. All loose money has gone into machines and tools that are higher on the priority list. Spindle moulder and stroke sander and drill press and router table and bench grinder and plenty of cramps.
It also seems I must shift to a slightly smaller motor. I was missinformed then and did not know that the largest motor I can start and run on 16 ampere 400 volt three phase is 5,5 or 6 kW. 7,5 kW is too large for the fuses.