Looks like they are still around.

http://www.panelplanner.com

However, a quick check of the products in their database shows that it's outdated by at least a year. For example, it doesn't have either the GRT Sport or the AFS 3500. I didn't do an exhaustive search to see if other recently released equipment was missing from their database.
 
You should also look at Accuracy Avionics, http://www.accuracyavionics.com/v1/index.html, They have a free panel planner. Obviously they hope they can assist you in some way, but no obligation. If you are going to need assistance on the build, Accuracy or Stein are two very good shops to consider.

Good luck,
David
 
I have their software and it is really nice and I am getting updates regularly but they seem behind in getting new products online. I asked for a couple of instruments and did not get a response.