Hi Gary,

The Forestay should be on the inside of the hulls. The Measurement should be on the building rules on the website... www.theracingcat.com.

On glass boats we don't seal the beams on the hulls. On timber just a tiny bit around where the bolts going through. Makes it difficult if you want to de-beam them overtime.

Seal the hatches with marine Sika 291. No need for screws either.

Matt