Thanks all for the comments!

Michael... is there not, in MoI, some way of unifying mirroring? That's to say a way of cutting an object to half and than mirroring it so that to have a new single object? Such a thing would be very helpful because booleans could not be useful in modeling tasks as this here. If I would try booleans by intersecting the two halves -even very slightly- there would not be consistency on the whole structure of the resulting object.