It probably depends on the # of servings you need. I did one and started with an 11X15 pan. I made two layers, stacked, and carved from that.
This is for a qtr sheet cake. If you just trace everything bigger, you can use a half sheet.
http://www.bettycrocker.com/~/media/Files/PDF/Cake-Templates/Guitar_Cake_template.ashx
I do not like the wilton Pan guitar's as the neck is too short and looks stubby. HTH.
I used a 13x9 for the two cakes I did. As was said above, the size of the sheet pan is going to depend on how many servings you need. For the first one I baked mini loafs to make the handle, the second one I think I used a square cake cut in strips.
I used a 13X9 and then a round 8" can pan for the arm! It was my first bass guitar cake, a little messy (lots of crumbs because I carved it) but it turned out ok
(in my pics)
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