I recently received a Picade for Christmas and I can say that I am quite pleased with the product. It was a fairly simple build process and the video tutorial was very helpful!
My build experience was similar to your own and I thought that I would share a solution to one of the issues that we both experienced as I also found that the usb ports of the raspberry pi 2 was too close to the speaker to fit more usb devices.
I decided to use some nylon m3 spacers to lift the raspberry pi a little so that the usb connectors were just above the speaker. This gave sufficient room to be able to fit all of the usb devices that I needed. I used something similar to these http://www.rapidonline.com/Mechanical-Fastenings-Fixings/Affix-3-8-Nylon-Round-Spacers-8-0mm-Pack-Of-25-33-3660
Ultimately I think it would be better if the speaker was shifted a little further away from the space for the raspberry pi. It looks like there would be plenty of room to do so.
I also used the edimax WiFi USB adapter as there is little room inside for a standard size adapter.
I intend to find a place for a simple reset button as well.
The only small criticism might be that I would have preferred micro switch buttons but I can always upgrade them in the future.