Thanks for the advise

See attached photo of my sketch which should help you.
Cheers, and good luck 😉

I need to do a similar task on my Mantua Bruma. Would it be possible to please provide a diagram of how to rig the sheets onto a single. I couldn't quite understand how you organise the sheets through a pulley to get double the distance on the mainsail. Thank you in advance. Cheers 😊

A sheet attached to the loop will travel a set distance.
Often the mizzen and staysail (or jib) need similar sheet travel, and the main sheet needs about twice this travel.
Using a pulley you can half or double the sheet travel distance.
So one sheet can control the mizzen and jib, and a second sheet via a pulley serves the mainsail. (Or you can have separate sheets for the mizzen and jib, attached to the loop at the same point, but each leaving the hull via its own exit eye.)
The use of two or more winches is rarely needed but make sure that your winch has sufficient 'strength' to handle your sails. A single winch is easiest to install and easiest to sail; also lighter.
Each sheet should ideally be adjustable by passing it through a bowsie on the boom. Differences in sail 'set' can then be accommodated.
I'm not sure that the lengths of your cords helps unfathom all this. (Excuse the nautical term !) Anyhow, I hope the above is of some help.
Your build is coming along beautifully, but make sure all th😉e sail controls are sorted out before you put the deck on !
Good luck 😉

Not all sails need to be the same angle to the wind. It is common for both a main and foresails, either a big genoa, or a smaller jib to be different. By far the best solution is independent control for main and foresails, but IF thye need to be controlled as one, then I would personally have the main slightly tighter than the foresails. Sails drive the boat to windward by the same effect as an aeroplane wing, i.e. they 'lift' the boat to windward, so the gap between the foresail and main is what allows the wind to accelerate over the mainsail. When off the wind, then it is just the wind blowing direct onto the sail driving the boat. The science of sails is a fascinating but often technical rad, when in reality it is a fairly simple concept.

I am refurbishing an Inga IV which I have a blog running.
I am now trying to figure out the correct lengths of the 3 cords to each boom (easy to calculate = length of each boom)
I have read that each boom cord should have the same length cord attached to the appropriate side of the circular cord that runs from the sail winch around a dummy pully.
My issue is that on the plans the exit point of each cord is clearly defined and the boom connection to each boom is again clearly defined as their end point.
Each boom is a different length so this means at full extension each sail will be at a different angle to the centre line of the boat, which I believe each sail should be at the same angle.
Main sail cord 551mm
Mizzen sail cord 466mm
Fore sail cord 367.
Am I correct that all sails should maintain the same angle at full extension?