Thought of..... sure.... but I'm terrible at business and last year I started taking some orders(these are all main speakers; not subs).
So far... 1st order delivered... 2nd order nearly complete but buyer can't take delivery due to forced moving to another country (matt34) and the 3rd order.... and the most extensive one by far.. is not complete... behind schedule and the buyer upset due to the long wait (which I totally understand).
I don't have appropriate work area to produce anything with any hint of 'efficiency'. My designs are far more extensive than anything you would normally purchase - so it takes a bit of work to fabricate the cabinets.
I will consider future custom orders... but... I am going to limit this to design/engineering/testing , etc.. That is, you want a special speaker system and I'll design it and have a local shop to me build the majority of it - and I'll do minor assembly and program the crossover, etc. and deliver it to you. I am not going to commit to building anything myself in the future. I may do some cabinet modification(not nearly as extensive as say Matt's cabinets) for some select people, but that's it so far as my hands on work in the shop.
I even have a pretty advanced stage design of a speaker that was intended for production (a very special speaker: low cost and performance/features virtually unheard of... it would give regular people the chance to experience reference grade speakers), but my partner (that was to handle all business, secure investor, etc.) ended up with some serious personal problems that forced him to abandon the project.I never finished/completed the design, however, as funding never appeared.

I can't explain it in any detail on a forum, as it's still a great concept and maybe one day I'll get a chance to use it.
-Chris