This would be sooooo much easier in the summer : I could take pictures of the set-up.
Anyway, here we go, I have made a sketch :
The custom made plastic pieces simply "rests" on the custom made ss L-shaped pieces (glued & rivetted on the lip)(see pictures at the very beginning of this thread to sea the place to fix the L-piece)
The hole you have drilled through the plastic piece : align this with the hole in the L-piece.
Under the lip (of the deck of the boat) you push through the hole you made in the lip and the hole in the L-shape a threaded ss piece (welded on a ss rod(see detail on drawing)). This thread sticks trough the plastic end piece, secure a nut on this thread : your forward tramp beam is secure ! Have a look at how the side shrouds are fixed to the lip of the deck and you get an idea of it !
Securing the back part of the front tramp : the back end of this tramp is stitched with a thick rope with at both ends loops to secure the loops to eyes fixed in the tick part under the beam that bears the mast.
The sides of the tramp glide in the same aluminium slides of the back tramp (take a look at the photo's on page 1 of this thread)These slide are riveted on the lips of the deck.
Hope this helps you.....