Fibre glass or Glue?
The point is glue is another name for resin used in f/g layup.
So yes you glue the wood to the hull. You can then use fibreglass (cloth) to enable the glue (resin) to be built up around and over the wood to make an even better structural joint.
So it all depends on how much strength you need. Many "glues" are actually easier to use as they are stickier so make it easier to hold the wood in place while it dries. If however you use epoxy (with a filler if you want) then you can use the same resin to saturate fibreglass to make more structurally strong fibreglass attachments. The resin in the fibretglass will chemically bond to the resin (glue) to make it all stronger.
So for super strength I would suggest the piece of wood with bolts set in place for the calorifier is glued into place. You will need some sort of prop to hold in place while epoxy goes hard. Then put in a fillet of resin with filler to a nice thick consistency around the edges so that you can then lay cloth from the hull over the wood and back to the hull on the other side.(from top to bottom and side to side) Make sure there are no air bubbles under the cloth then add more layers as you think fit.
Now this will make a super strong attachment possibly an overkill possibly just glue will be adequate.
good luck olewill
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