For anyone new at sanding, I have a tip to hep you get over one of the more potentially time consuming aspects. First, though, let me apologize for the crappy photos. Still putting the studio back together, so I'm shooting in bad lighting.
When you get your Pip the bottom edges will have some extra resin.
Head to a generic tool depot (like Harbor Freight) and get a belt sander. This one was $40 and has a 1" x 30" belt. Carefully (and I do mean CAREFULLY) run the edges you want to knock down against the sander's belt. Work in extremely small increments—otherwise you'll have a whole bunch of things to fix later. You've got all the time in the world...so don't rush it. I THINK the belt was 120 grit, so I was done rather quickly.
After getting some of the excess resin removed, I switched to wet sanding with 220. There are a lot of advantages to wet sanding. My favorite is that it keeps dust from getting everywhere. I actually have a 10-gal aquarium ($10 at Petsmart on special) I keep for just this purpose. When placed upside down, the glass surface is nearly frictionless and allows the piece your sanding to slip right off the paper as you go. I feel I get better results (when edge sanding) than doing it by hand or on a hard surface.
Wet the paper and the glass, sand in one direction (probably not a requirement in this case) and keep everything damp. Don't worry about the mess...the aquarium also keeps it from running all over the place. Put as little pressure on the object your sanding as possible. Pushing hard on it as your sanding could make it lopsided. Let the object's weight work for you. This piece only took 20-30 quick passes. That's like...1-2 minutes of work.
The end result is 2 halves that will fit together perfectly with no high spots.
Hope this helps someone!