See, MIDIbox is a non-profit DIY project - actually, it's more like a community, and I can assure you that you will receive plenty of help from the more experienced guys here if you follow some simple rules which you are obviously doing already :thumbsup: : the most important one is probably that you have to be willing to invest some time into reading the information that can be found in the forum, on the WIKI, and in the many project descriptions and tutorials on uCApps.de. Once people realize that you are serious, and that they can expect something back from you (e.g. a nice project with some pictures and docu), you will find plenty of help here :flowers: !
The second rule, which is actually more of a recommendation, is that you start with a small project and try to implement parts of what you aim at ultimately. As MIDIbox is modular, you can always re-use the modules for the next project stage. You can find a nice introduction to the various modules (some of which are obsolete or near that) on uCApps.de. You will see that you will need modules like DIN for digital inputs (=buttons), DOUT for outputs (=LEDs), MF for motorfaders, etc.
Take a look at the old gallery for some inspiration of what other people have done - on that page you'll also find a link to the forum gallery. You will probably realize that very often the mechanical aspects of a project are the most difficult for many. It can be extremely expensive to create that professional look for a one-off project. But then again, you can find many clever ideas of how people made their boxes special and good looking.
I doubt that you will find motorized faders with coloured trays, but these you could build yourself. LED illuminated buttons are not a problem at all if you take some money in your hand. Mostly we end up using the cheap and simple ones for cost reasons...