Hi Michael,

and again welcome to the swarm.

Booms you can use anything that fits through a 80mm circle. I am currently using a length of Mossie Mast with the track cut off. Have used Paper Tiger/Sabre/Arrow mast section cut to length and just round tube less than 80mm from local alloy supplier cut to length, know of a Laser mast being used and some use carbon tube again less than 80mm, it's up to you what you can find.

New centreboards JK Fibreglass (bendigo) make them for Mossies. Second hand, many A class boards fit,