I can tell you from experience that the sled, itself, is VERY sturdy. (I had one heck of a time getting it in my dash because it wouldn't flex -- ended up milling out part of the dash. =]) So, if you wanted to have the Empeg under the dash all you'd have to do is get creative.
You could do some drilling in the sled's sides and then bolt a harness (just like under-the-dash CB's use) onto the sled ... then detach and mount the harness wherever you like. Once done, simply re-attach the sled.
If you wanted a more professional look you could build a small enclosure (out of your favorite material) for the sled and THEN do your hole-boring and bolting...
I don't recommend it, though. You wouldn't want your passenger(s) to miss all the cool visuals, would you???
-- Bleys
"If you would judge, understand." -- Seneca
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"If you would judge, understand." -- Seneca