Looks good Dave, I've got the Probe Holder project covered, purchased the nylon machine thread screws yesterday and have plenty enough 3/4" scrap acrylic and neo mags to make at least four 3-4 probe brackets. I'm thinking that three holes for the std 1/2" probes (PH, ORP, Conductivity) and one smaller for Temp probe. Building one for Eric W, Seth, myself and one for a RF give away. I also have some machined caps with key-holes for the Calcium or Kalk reactor that we can use. I believe its sized for 3" but I'll check exactly what size it is for you. Once we get all the materials together I'll plan on driving down for the day to see if we can knock it out.
Cheers, Todd