Duane,
The changes to the angles was my "little darlin wife"

the front was changed twice, once for more room in the lower storage compartment, second time to accomidate the front box on the tounge. The rear was changed so the refrig. door would open, there again giving more accessible storage space.
The only other tool that I use is a table saw, have shaper bits that let me do drawers and doors. Really the rest of the tear is done with what you have. Lots of clamps, glue and screws.

You can take a straight board, clamp it down to what you want to cut and make as good of a cut with the circular saw as you can with a table saw, just takes a little more time and effort.
As far as misstakes, I make lots of them, so just hang in there, be inventive on the cover ups. " Yes, I ment it to be that way! "
Frank