2x10" vented horn idea

I understand it's not perfect that's why i'm still working on it and try to get as much info as i can get before building a prototype. I only made sketch's to see if its possible.

Because i'm a mobile dj i wan't to make a cabinet that's not to big (good to handle) en is loud so i can use it for all kind of venues. 

It's a bit like Peter Morris make a small cabinet that can play with the big boys.

I saw on the forum of Peter that he also uses the 4593he from about 600/650hz. (rcf hf950 horn)

so i start changing the cabinet so the horn mount is a bit bigger 2x  40x20cm

this allows me to strech the xover point to 650/700hz. 

box size 70x40x55cm   WxHxD

What I'm wondering is do you really need the benefit of two drivers? You can get really quite loud with a 1x12 horn loaded midtop and could buy a superlative 12" driver capable of taking a tonne of juice for the price of two decent 10's. The cabinet would be deeper but overall dimensions would be the same or less.

The build would be miles simpler, the cabinet would be lighter, and you might only lose about 4dB total SPL. Depending on how much smaller and lighter you could make it, and your total cost of components, you might consider building twice as many of the simpler box, so as to have extra for the times when you really needed them. Or more practically, wait until your lack of SPL becomes a real issue before building more.

The other advantage of the two box solution is that you could increase your flexibility for wide HF dispersion or multi-room/wide area coverage when necessary, and the horn coupling on the low mids when using two boxes, along with the extra SPL capacity of the 12's would give you an edge of about +4dB on your 2x10.

That doesn't make sense - what you're proposing is a lot wider than the Peter Morris designs?

Every drawing you've posted has the mids at the sides of the highs, making them a lot wider than the 35-ish cm of the PM...