The two pieces I made were for a humbucker rout and for a tele-style neck pocket. These will be common elements on guitars I make in the future so this will equal a lot of time saved. I made these on quarter inch mdf this time. Last time, I used three quarter inch and it was a beast to shape and very frustrating to get accurate.
The first step is to draw everything out very carefully w/ a straight edge and a carpeneters square. I got the measurements I needed from various places online. This took me about an hour and half. For the last project I didn't have this kind of patience but now that I know I can pull it off, it's easier to reach down into the depths of my psyche to find another five minutes of attention span to erase a line and redraw more accurately.
This is the neck pocket:

I made the top of it extend an inch longer than it had to be. Hopefully, this will give the router something better to rest on when I use it so I can better control it. There's lines drawn so I can get it in the right place.
Same deal w/ the humbucker routt:

Ultimately, it was a mistake to cut it out so small, at least before I had the middle cut out. It made it really hard to clamp down as I worked on it:

It was too small for me to use a jigsaw so I had to use a coping saw. As seen in the picture above, I drilled out the corners w/ a handbill so I could turn the blade. The initial cut was none to accurate:

But some time w/ a file got it in good shape pretty quickly (I actually filed it a bit more from this point and it looks very clean now):

Same deal w/ the neck pocket only this time I could use the jigsaw to save time (and I'm actually more accurate w/ that than a coping saw). It is nearly perfect:

This all came together a lot quicker and better than previous efforts so I'm pretty pleased. The only problem w/ using the quarter inch thick mdf is it's really too thin to use directly on a guitar so I will need this to make some thicker templates. It's worth the extra effort for the added accuracy.