The first points are now fixed – the holes in the baseboard are for the point “motors”.
A small cork sheet is “sandwiched” between the point and the (pre-wired) motor, then glued to the baseboard. I found it easiest to use a bit of double sided tape to stick the point to the cork sheet first.
Once the junk from the old TV table had been moved to the new shelves, the second baseboard could be constructed. This sits on a similar frame to the first baseboards. Again, the edges will eventually be covered by a pine moulding.