The VMBC kits are pretty good. You may need to watch the drawing a little. I built their 25" Wavemaster last year and I'm very happy with the result but the drawing that came with that kit was slightly out in places. The drawing for the Wavemaster was a copy of the original kit plan from 1960s-70s and the kit parts were slightly different. That said the parts are substantial and if the Patrol boat is as good as the Wavemaster I'm sure you'll be delighted with the result
Build to the marks on the timber and use the drawing as a guide. Do plenty of test fitting before you glue anything. You want to make sure the hull frames are good and solid before skinning as pulling the hull skins around can put an awful lot of strain on them.
Check out my build of the Vintage Model Boat Company, Wavemaster 25.
http://www.modelboatmayhem.co.uk/forum/index.php/topic,40484.0.html
You are absolutely right with the drawings being out, I have had to modify several bits, also the instructions are definitely not good enough for the total novice as I am to model boats, but I am from technical hands on background and have recovered a few problems quite easily.
The frame and removable top sections are to be strengthened here and there, I already had that in mind, but keep on with the tips please
I have ave had to shorten the keel by the thickness of the Transom board to make it fit nicely.
And have glued some blocks on for the Breast Hook to pull down to so as to make life easy.
The rubber band trick is a good method of holding bits together and a tip for supply of these is "be nice to your Postman/lady