Couple of other considerations....
We just got finished LEDing our 11th game. We used a kit on one of our early games - it came our pretty good but we still ordered a number of extras to get it just the way we wanted.
After that one, every game we've performed the "LED audit" with the legal-pad and the PF up. It is not just color and intensity, but also "base type" (44 or 555 (and both are in every game)), lens type (maybe no lens, clear lens, frosted lens) - so when you are done, you'll have this list. Then you have to go to a website and enter in each color/type/style. And there are also "flex bulbs" or "bendies" for when the socket is perpendicular to the insert. There are flashers and they can have differing bases and colors and number of SMDs - and those can be "bendy" also.... We have placed all our individual orders from Comet and we love them.
When you are entering in this long order of +/- 20 items sometimes they are out of stock or whatever. Then you get to decide if you will take an alternate style or wait. Invariable I always seem to miss something (although now I have my own "tackle-box" full of extras) then you have to place another order.
The last machine we just did we actually just ordered a Cointaker kit. It would have cost at least $100 (I always spend at least $150) to do it a-la-carte and the kit was $200 but it worked out pretty good and saved the time of "auditing" and placing the long order. I will customize it some but it turned out really well right out of the box and they give you a little map/list so you can check-off as you go. They probably know about that hidden GI that you might have missed (even if you checked the manual).
PS - When I quote $100 to $150 a-la-carte, that assumes you buy the nice .69 cent LEDs, not the .38 cent variety. I tried those and was not interested in using them again.