This looks like a nice unit. The indicator unit attaches over the vapor unit. Inexpensive too.
http://www.trailtech.net/022-PDA.html

There are no hazard or brake warnings

That's because it is designed for bikes - and is not to meet EC automotive legislation. Nice unit though, and cheeaap!

and would fit just snug ontop of scuttle under my aeroscreen rather than behind the steering wheel

i didnt think you needed a hazzard light as long as the indicator light flashes

The unit comes with 8 colored plastic inserts from which you can choose 4 to use at any one time. A creative individual can probably come up with a nice surround to accomodate the aditional 4 lights, plus a couple of additional gauges?

On the negative side, it's pretty small... Aside from readability issues, any thoughts on the size?

Here is a video of one installed on a bike. The audio is several seconds behind the video. The guy either has monster hands, or the unit is small. Looks very readable!

http://www.youtube.com/watch?v=-SUekUIDn2E