Hi Mike,
From the Moody Archive (link towards the bottom left of the Home Page):
I= 17.70 m. J=5.29 m, P=15.90, E= 5.15m.
That's all a sailmaker needs to give you a quote for a sloop rig. I'm afraid that, if she's a cutter the Archive has no rig dimensions to help you with the staysail, but does give areas:
Mainsail 41.0 sq.m., Genoa 65.0 sq.m., Yankee 52.5 sq.m. Staysail 19.6 sq.m.
While those areas don't let you design the sail, a sailmaker may consider that enough for a quotation.
No benefit from a triradial for a furling main - the sail needs to be pretty flat to avoid fouls when furling. You need to think about whether you want a roach and what length battens go with it. No battens need a negative roach (hollow leach) short non overlapping battens zero roach (straight leach) full height battens full roach. Note that an in-mast furling main obviously has vertical battens , if any.
Triradial for a genoa is a good call imho. but you will need a padded luff with it, to keep it flat as you reef.
If she's a cutter, I would go for a triradial yankee and cross cut staysail.
Peter.