To fit a bow thrust it is easier to fit a plastic tube right through the hull.
Mark up the centre of where you want to fit it and drill out a slightly smaller hole.
The hole wont look round, don't worry about this it is the shape of the hull doing this.
Open up the hole with a file till it is a good fit with the pipe sticking out of the hull.
Again if it isn't don't worry.
With the tube in the hull apply a little superglue to hold it in place.
Let the glue garden.
Any gaps will have to be filled from the inside with filler.
FILLER, I use P38 car body filler for these operations
Now leave it overnight to really harden off.
Cut off the excess pipe and file and sand to the shape of the hull.
Fill any small imperfections with P38 and fare in with wet and dry paper used wet.
It doesn't take long, it is harder to explain than do.
The Anchor Recess is just a box fitted inside the hull.
Cut the parts to fit and shape as necessary. Fix to the hull with superglue.
When the glue is fully dry go over the joints inside the hull with P38.
On the outside fill in any imperfections with P38 and file, sand off.
Always remember with filler, the more you put on the more you have to sand off, so use sparingly on the outside.
The inside of the hull part cant be seen so no need to sand off just ensure there is enough to give the joint good strength.
Bob