Belinda;
As designer of this panel, you need to ask yourself how many switches do I need to accomodate...are they of primary or seconadry importance (this will determine how close and easily reachable they need to be)...do I anticipate needing to add another anytime soon...that sort of thing...the appearance and final location is obviously up to you, but you need to clear shifter if your putting it under center of dash, and your knees during getting in and out (and God-forbid accidents*) if mounting to the left. Discretely under the dash, but easily reachable, so no visual impact on the original dash might be nice. Also, if you put indicators on the panel, they need to have a day/night brightness setting...indicators bright enough to be seen in daylight (LEDs are not good at this), will be WAY too bright at night without some sort of throttling back of the brightness.
* Switch toggles sticking out from sharp edged panels are not friendly to flailing body parts during impacts...use big knob switches or recess protrusions and rounded edges to prevent impalements and lacerations!
Try too use existing hardware to mount panel...there's a lot of it around, so you shouldn't nee to drill new holes...
Here's the (USS Enterprise style) dash of the Snow Weasel, where I replaced the ashtray with a panel which contains everything additional: http://www.sw-em.com/snowwsl_dash_lores.jpg
Cheers
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