What follows is a series of photos of the rabbet cut at the bow and hopefully shows you the sequence of events to get the desired results. . . . . . .
Photo 1 is a close up of the rabbet cut at frame 1, I do this at each frame along the keel at my dummy frame positions to gauge the angle of cut
Using these part rabbets as a guide I join up the rabbet groove between frames.
Photo 2 shows the chisel being used with guide depth marked on the blade to gauge depth of cut.
Photo 3 shows the bow with rabbet, rabbet back and bearding line and a small test piece of plank sat in the rabbet at frame one to check for fit.
Photo 4 shows close fit of test plank piece in rabbet, I'm aiming to get it this close all along the rabbet from bow to stern.
Photo 5 is a long shot down the finished rabbet groove from the bow, the rabbet groove from frame 6 to frame 14 is a simple 'V' groove and has yet to be cut.
Photo 6

I couldn't resist

I had to make a template from card to see how things would lay. I use card board templates to get a snug fit to the planking.
Photo 7 shows how the guard board template fits snug in the rabbet at the bow.
Photo 8

well I couldn't just stop at a template could I?
I took a 300mm long scrap of planking material and cut the bow end of the 16mm wide x 4mm thick guard board and tried it for fit, shaving a bit off the edge here, test fitting, shaving a bit there, bit by bit until I get a snug fit.
Again I used the blue patch high spot trick by daubing the edge of the plank with blue marker pen (soft children's blackboard chalk works too) and pressing the plank in place before the pen has time to dry.
Then I play my save off the blue spots again.
For a long plank I would daub a short length and hold the plank in place, take it away and daub the next section along and re fit. I do this all along the plank and only then do I check for blue spots and shave off the blue high spots all along the plank.
I use a chisel held perpendicular to the plank edge while the plank is held in my cheapo work mate

and draw it along the plank like a cabinet scraper to remove a fine shaving only where the blue spots are.
You might find a few high spots in the rabbet too but take care you don't remove too much.
I cannot stress enough that for good results the chisel blade must be sharp

It takes a while but is it worth it for the satisfaction you get from the results.
Photo 9 shows the forefoot & keel at the bow and a close view of the hood end of the guard board. The keel is 13mm wide to get an idea of scale.
Photo 10 is meant the show the nailing details at the hood end, I'm using 16mm x 0.65mm steel dressmakers pins to hold the plank in place. No glue at this stage, it's just a dummy run at this point. The pins are set in holes bored with a 0.5mm steel dress makers pin set in a pin vice which is in turn held in my 18V battery drill.
This gives my nails/pins bite and as you can see they don't split the delicate hood end of the plank.
Photo 11 shows the curve of the top edge of the guard board, this boat is gonna have some pretty curves

Also I am experimenting with the caulking seam, you can see this in photo 11.
Master Hand was work boat and the caulked plank seams were a prominent feature. At 1/16th scale they would be visible so I am opening up the seam between the planks to just wider than a scale seam. When I seal and paint the outside of the hull the sealing treatment will flow into the caulking groove between planks and hopefully give a caulked seam look.

I do this by painting the edge of one of adjoining planks to two thirds the thickness of the plank from the out side face. I take my sharp little no. 110 Stanley plane and just shave off the blue bit all along the plank edge.
The caulking groove is about as wide as the thickness of three sheets of A4 photo copy paper.
Photo 12 shows the inside face of the guard board where it meets the bearding line, its a snug fit and I'm pleased with my efforts.
The rabbet groove does not have to be cut with surgical precision, just as long as it is even and smooth along its length. When the guard board is finally fitted, its inner edge will be cut to match the rabbet groove whatever its shape may be.
That said it is worth taking time to get these first planks next to the keel fitted neatly, they are the most difficult planks to fit properly and are the foundation for the rest of the planks to come.
