Rolling your own

How hard is it to build your own speakers and have them sound great. I dont want to make to simple the fact of building expensive speakers but It looks like some off the shelf drivers and crossovers and go to, is it Poland? to have a few hundred cabinets built and finished to your specs.

What about copying current hi end speaker designs, and the drivers, and the way their cabinets are built. Some of the best playing guitars I have ever played were custom built.
Can you study this craft then do it your self or can you make a 15k mistake? What do you do if you want to sell them.

Really peaking my interest currently is maybe a copy of the legacy focus with some atc drivers? With a copy of the dunlavy tower woofers, or my ultimate, a copy of the German Physiks Gaudi with 4 ddd bending wave drivers, six mid metal driver speakers and 4 super sub woofers? The parts not including cabinets (if you didnt buy the gp subs) about 15k do you need special crossovers for the ddd's I burnt mine up but the new crossover is suppose to take care of that. Could you use pro audio crossovers that are active and adjustable?

The only home built speakers I heard are usually horns which are ok but not what I want.

The type of music I listen to mostly modern alternative,classic rock, Ill keep my electrostats for the old smokey jazz thing. But some times I want a concert in the hole ( the room is undergrond) so i want the db inthe 110-120 range.

My room is 20 x 25 and have different ss amps and 4 big 250w tube monoblocks. I live in the middle of no where and no one else around the area has this vice.

Thanks

Kelton