I put blocking in mine, so that they can be assembled with screws.
So the deck house can be unscrewed from the deck, and then
the pilot house can be unscrewed and removed from the deck house, and
the mast slips out of a tube and a pair of plug connections for lighting.
Conversely, assemble the pilot house onto the deck house, then the deck house
onto the deck, then slip the mast into place, And then put the deck on the hull.
Any part can be disassembled and worked on or painted as required.
:)