I was heavily involved with the mini40 model multihulls before heading to uni. 1.2 long, 1.2m wide, 2.4m tall masts.

Infact there are still two tris living in the garage at my parents place. They were good. Very easy to control upwind and would never capsize, only ever nose-dive downwind if you weren't watching the breeze and got caught by a big gust. Having three rigs of reducing size helped.

We built everything including, my favourite, the carbon spreaderless aerofoil masts with sail track. They were light, stiff, rotating and indestructible. A simple mould made of timber cornicing prepared with resin then wax and PVA release. Laminate was a layer of carbon unis (for the overall structural integrity and stiffness) and a layer of light glass cloth (for durability across the unis). The track was just hollow carbon kite frame tubes in the trailing edge when gluing the two halves together.

Good fun. But agree with previous comments, a good winch servo is essential. Basic remote controls are good enough though.