Well, I installed an Empeg w/ tuner, Eclipse amp, Eclipse 6.5" 2-way speakers (in the front doors) and an JL 8" sub in my Insight over the weekend. Everything went rather smoothly. I only had to make minor modifications to the docking sled and the ISO-DIN brackets that hold the head unit (now the Empeg) in the dash.
The problem was that there was NO structure in the dash to use the bend-out tabs on the docking sled. The Insights head unit was held in using two brackets that screw to the side of the unit and then screw to side supports in the dash. The screw holes on the head were on its center-line (horizontally). Bolting the brackets to the sled using the center-line holes would have caused a collision between the mounting bolts on the sled and a small screw head protruding from the side of the Empeg. Anyhow, to keep this short, I had to drill some new holes in the brackets and the sled below the sleds center-line and then grind down the bolts so they wouldn't scratch the side of the Empeg as it slides into the docking sled.
It looks really good except for the 16th to 8th inch gap between the Empeg and the dash. I may try to find something to fill the gap, but it's hardly noticeable unless the sun is shinning on it through the rear window. Also, the amber faceplate almost matches the more orange colored digital readouts in the Insight. I may try to correct this with beakers inkjet produced faceplate idea.
If anyone is interested in photos, I will try to borrow a digital camera and take a few snapshots of the sled and brackets. It's pretty easy to take the Insight dash apart.
Happy listening,
-Jeff