Hi Jolly, I strongly suggest SUNRISE YACHT PRODUCTS -
http://www.multihullnets.com/. They have made dozens (that i personally know of) mystere tramps and are the best at making them i have found.
DO NOT USE SLO canvas and tramp. They have never made mystere tramps and took my old tramp as a template and never returned it (despite several people from this forum and others contacting them on my behalf)
I have a front tramp on my mystere (5.5) and love it. it holds my cooler, anchor, radio and 2 righting bags.
I put 2 small eyestraps in the front hulls (with backing pate) and attached it with those eyestraps and to the beam
(circled in blue) -
as per the boom, you could try contacting mystere in Quebec or simply make your own (probably for less money) with a simple alum pole.