Thanks Mel. I appreciate the kind words and am glad that you have been inspired by my work; a true compliment.

Tac, my wire strippers/crimping pliers have a mandrel for crimping insulated connectors at the very tip of the crimping jaws, very much
like the pair shown here (click the pic for a larger view). Truth is I used the very tip of the mandrel to get a solid crimp. The plastic insulation on the terminals is very resilient and did not seem to crack or pierce. I gave each of them the "tug test" and if I felt any play at all I squeezed them again until they were solid.
Another great weather day to be in the shop! Sun was out, it was well above freezing. In fact, although I had the electric radiator going, I didn’t fire the kerosene heater until after the sun went down. Got the loft up to 55 F despite Karl moving vehicles in and out thru the big doors to do oil changes.
We started off by replacing the trap door pulleys and rope, then I gave Karl a hand moving a big piece of plate glass that he had left over from a railing job.
Anyway, I had decided to go ahead and cut out recesses for the pillow light switches, so that is what I did. I’m not super proud because it looks a little crude, but it won’t show in the end anyway and it is getting done. If I had made a router template for the trim blocks, I could have used the same template for the wall recesses, but since I used the jigsaw on the trim blocks the openings were a bit uneven.
I started by positioning the curb side pillow light block, pilot drilling and screwing it into position using the two upper screw holes under the light. (I forgot to take a pic, so am just holding in place for the picture here.)

I ran a sharpie around the inside to mark the outline of the recess, but I really needn’t have, because the next thing I did was use the four corners of the trim block recess as a drill guide, drilling out the corners with a 1/4 inch bit just thru the ply inner skin of the wall. Here I have removed the block and masked around the outside of the pilot holes.

Next I used the standard utility knife to score along the tape lines repeatedly. After a few passes I would make an angled cut inside the line to remove a little wedge, similar to how a chisel would, relieving some of the drag on the blade. Repeat until thru to the foam all around.

I thought that I might be able to just pop the plug out with a little prying action, but I am very happy to report a nice solid bond between ply and foam! Here I have used my wide chisel to get down to the last ply.

Chips, anyone?

Foam stuck very well.

Next I set the depth on the utility knife to about 1/2 inch and scoured the foam in a grid pattern (like dicing a mango from the inside out), then used the chisel as a scrapper to drag the little chunks out of the hole.

I was a little concerned because the two screws hidden under the light holding the trim block to the wall blocking (behind the skin) are more or less at the top end of the trim block, while the switch is lower where you will tend to touch and perhaps put leverage on the block near the bottom. Since I had just used pine for the internal wall blocking I wanted to hedge my bet and add a third mounting screw down under the lower edge of the switch plate. Unfortunately I had not planned ahead for this. So, taking someone’s idea from the big thrifty thread, I drilled a 5/8 inch hole about 3/4 inch deep using a Forstner bit. I used 5/8 because that was the size of dowel I already had on hand. Next I cut a piece of the dowel to length and dry fit.

In prep for glue, I masked off with a piece of the rosin paper.

Then I repeated all of these steps on the street side.
I hadn’t brought my GG with me today otherwise I would have glued the dowels in. Hmm, maybe I could have used GS which I think I left in the loft. Anyone know if it’s okay to store GS in freezing temperatures?
I finished up by scuffing and putting a second coat of poly on these switch blocks. In all about 4 more hrs of work.
Once home I set my bottle of GG out where I will be sure to remember it. It seems to have thickened up in the bottle and there may be some that has gelled in the bottom, but I think it will be fine.