I've been thinking about instrument clusters myself recently. The problem I see with all of the aftermarket panels, at least the ones that I've encountered, is that they're all flat. They're functional, to one degree or another, in that you get the gauges you want, more or less where you want them, but they're just lacking in style. the original clusters have depth, and that's part of their character. Of course, I'm sure that making a replacement panel with depth would take a lot more effort and cost a lost more.
That because most dash makers started with street rods and Tri-5s which are flat, flat, flat. It also is easier to take a plate of aluminum and mill some hole sin it, or take a sheet and put a few bends in to replicate lines.
A possible solution to this that I've never seen would be a vacuum formed plastic piece. You could sculpt whatever appearance you wanted to create the mold to look like, lay the abs over it, heat, vacuum down, and there you go, custom dash. Compared to machining. the process is actually much easy and cheaper to run once you have a design done. However, the tooling to perform the work is not cheap. Once completed however, you could pull clusters for around $200, give or take based on complexity.
For something completely different, you can always substitute a 71-74 B body cluster. Leave as woodgrain, sand and paint, whatever.
