On a very damp and cold morning I ventured out to my model storage shed and took some measurements.
Main Mast 51 1/8" from the deck Gaff 17" Rear Boom 22"
Fore Mast 50" from the deck Gaff 14 1/2" Boom 17 1/4"
Jib 11"" fore jib 14"
Boom 23 1/2" this is the total length and about 6" is inside the coaming so 17 1/2" from the prow.
From memory my boom is about 3" above the deck. Sorry without rigging the model I can't be more accurate.
Hope this helps.
As this is not built to any scale we all have slightly different setups but they all sail very well and if built light are very fast in any sort of blow.
Our models have the keel sealed with lead so we use a couple of posts attached to the keel with a horizontal handle to lift and carry the model. This means we need a hatch over the handle to allow for this. It is important to get the balance correct to save your back so the hatch is positioned between the masts. The cabin is behind the main mast.
I also have a pond Yacht 5ft so am attaching a couple of pics FYI