Australian Pearl Marble

My husband and I are building a new home.  We have selected an Australian Pearl Marble from Italy for our Master Bathroom vanities, whirlpool surround, and within the tiled shower, we will be using this marble for the shower shelves and sill.  On the label, the slabs say they are double-resined and vacuum-sealed.

In checking out the Marble Institute of America's guidelines for the care of natural stone, they make mention that resin-treated stone may or may not go well with sealers, depending on the type of resin that was used, and whether the sealer is compatible with it.

Our fabricator said they would use a solvent-based sealer on it, and that as the customer they would recommend I repeat the treatment once or twice a year.

a) Any information regarding Australian Pearl Marble that has been double-resined and vacuum processed will be greatly appreciated.

b) Does the double-resin process eliminate the need for a sealer?  Our intention is to squeegee and towel dry the shower after each use as we do now with our fiberglass unit.  Do we need to extra careful about drying the marble areas, or does the resin treatment itself lend a good amount of protection from water issues?

c) One of our shower shelves had some small surface scratches in it, which the fabricator is going to remove before installation.  For future reference, is resined marble that easy to scratch?  Can minor surface scratches be fixed by a homeowner?  Does removal of the scratch also destroy the integrity of the resin feature?

d) Our stone is highly polished, but there are small lines and shapes on our stone, which do not have a gloss to them, and are matte in appearance.  They correspond with actual lines/marks of the stone itself, and do not appear to be damage.  We are curious as to why the stone is glossy everywhere on the surface, except where there are these little squiggles and patches that are matte.  It almost looks like there is something smeared on the stone, but indeed it is the stone itself.  Is this typical for this type of stone?

Thank you in advance for your help with my questions.