For something special like that, I can see it. I have done a couple pre-arranged rehabs but I always am worried that my end result might not be what they expected. I always tell them that they should just grab one that I have available and if they still want, I can buy their old grill for a small fee. I do work up grills to a customer specs, but I don't make them commit unless it is a very unique design. Like my last blue head. I did one a few weeks ago and after it sold, a lady contacted me about it and wanted it because it matched her blue kettle. So, I told her I would find another blue lid and rehab it. I even offered to put black handles, and knobs on it since her blue Master touch had black handles. Well, time came to make the deal and then money is a problem. We had agreed on the price, but "her bank got hacked". Anyway, all I had to do was put it up for sale on CL and FB MP and it was sold a half hour later. No refunding money or hard feelings or anything like that. That is just my thing.
But if someone wanted a lid re-porcelained or other exotic mods, then, yah, I guess it would require a down payment and other pre arranged specs.
We really don't have that kind of market base around here though. Mostly lunch pail type people around here. I would love to go above and beyond some times. I have two Genesis Platinum SS framed grills that would be perfect high mod, over the top bases for rehabs.