Back to the drawing board... stock low dollar 360
Maybe, list the mod., the results in sec., and the cost to you for that mod.
I look at everything in terms of work for me, and the cost in $$$ for anything I do. For example, I can tell you within a few $ how much it will cost me to do the bodywork on any car I have here. I can tell you what I have invested in it also. Those cars have always fond a new home, some I have owned for 5-6 years, some 5 minutes . I have hardly ever made a dime worth of profit from any restoration, break even usually at best,.. BUT I have never sold any car at a loss. Because I buy the project and do my own work,.. you make or lose on anything when you buy, not when you sell.
I measure everything by the "fun factor" and $ spent.