Basil, I think most reputable wood working shops (maybe a cabinet shop) or furniture restorer can easily do this job.
To me, the key is approximating the original dash wood color and finish. Many of the Spits/GT6s used French walnut wood, which is not dissimilar to some types of teak. The finish is NOT high gloss, but satin.
Of course, you already know that. Also, from time to time there are a couple of vendors on eBay that sell unfinished replacement dashes, some with an extra hole for another gauge. All you have to do is apply the finish.
The dash is a huge focal point on the car, the eye is automatically drawn to the dash. It's worth getting right IMHO, and well worth any effort to do so.
Please let us know what you do, and post pix!