hi there
When you read instructions for the build of your tug, does it give any indication whether you do a double planking? Where you put your first layer of planks over the frames, sand and fill and then on top of that glue a 2nd layer of planking which overlaps and covers the joints in the first layer of planking.
Some Billings kits have this method and also I believe the magazine build of Bismark and Hood use this method.
If this is the method which is used for your tug build, there is no need to put tissue mat and fibreglass resin over the top of your planking, as in the Cervia build. To seal the planking use what has already been suggested, Finishing Epoxy Resin, which is very straight forward and easy to apply, as long as you stick to what it says on the tin (but not literally
) No need for matting.
As far as your method of building the frames and the keel goes - as long as it keeps the frames and keel square.
and also make sure the keel has no bend in it.
This is the advantage of fastening the frames to the building board first upside down; and then placing the keel into the correct slots of the frames. This ensures that the keel is kept nice and square and the frames are vertical to the keel.
Also, it gives you a solid base for when you start to plank.
These are only suggestions; as your building skills and modelling advances, like everyone else on this Forum, you will have your own way of doing things and all of us modellers borrow someones idea and then adapt it to use themselves.
If that doesnt work - we tweek it a bit so it does work.
Happy Building, happy new year.
Aye
john