Unpack the case piece bag and separate the laminate parts for sanding. Spending some time here wet sanding with fine emery paper will give a *much* smoother rounded finish.
Carefully sand the side rings, the faces will be hidden so scratches aren't so much of a problem but they are fragile so don't put too much pressure on them.
Some of the bolt holes are routed to be a tight fit to form a rigid case, you may prefer to enlarge them a little to make assembly easier.

Top row, from the left:
PCB ring
Bakelite top (Not used in this version)
Wide quarter rings
Middle:
Wide ring
Base (Not used in this version)
IR plastic lid
Narrow rings
Half ring
Bridge,back and feet
Bottom:
Wide half rings
Narrow half rings
Narrow quarter rings