You will need all the tools listed in the CLC Manual that comes with your kit. In addition to those tools, we found the following to be very helpful in the building process.

We set up the drill press with a sanding cylinder.  These are available in many hardware stores and make sanding edges and curves very easy.  We had several grits for coarse or fine sanding.  It was useful in sanding off the little points left from the cutout removal.  We screwed a piece of plywood with a hole cutout in the center to the drill press platform.  The hole lets you recess the sander.

You can also elevate your work and freehand sand on the inside radius.

We used regular name brand thick mil plastic sandwich bags for our epoxy pastry bag.  Putting it in a cup makes filling it a lot easier.  We used smaller batches to give us a little more time to work.  A large batch gets hot fairly quickly.

If you tie a string around the top, it gives you better control and utilization of your material.  Without the tie, the epoxy wants to flow backwards and forwards.  The size of the hole cut in the tip determines bead size.   I did my whole boat without duct taping the end and never had any problems, but if you use the thinner bags and use a lot of pressure you may have a problem.

I used a router bit with the ball bearing roller on it and got into a little trouble.  On the thinner material, there is not enough material left to support it for the cut on the second side.

We made some very handy sanding sticks by glueing  tongue blades to sand paper with carpenters glue and then cutting them apart with a box knife.  Go easy with the glue or it will wrinkle the sand paper.