Okay I have an estimate on the metal clip pieces - thanks again Alfred for the detailed specs on the clips. I contacted a firm recommended to me called "Small Quantities" which specializes in metal reproductions such as fasteners, etc in relatively small numbers. There would be an engineering fee of $450.00, and then the clips would be $4.90 each for a quantity of 100 to 149, 4.50 for a quantity of 150 to 299. So if we did a quantity of 100 (50 sets for example) this would add $14.30 to each set, if we did higher quantities it would be a little less. I am assuming sets with the metal clips would work as replacements for non-clip pieces. So, a total for pieces with metal clip inserts should be around $40.00. This is a little more money, but probably well worth it for some, and yet there are others who will probably just want the one-piece clip. I suppose we could do some of both as well, that would just take a bit more planning.