Right, if all goes well today I *MIGHT* possibly swap my Ashdown Fallen Angel combo for a custom made 4x12 and Marshall VS8008 power amp over at 
www.phoenixsoundworks.com.  Now I'll be running a v-amp thru these til after Christmas (new jackson first pre amp later!) and I have the dimensions of the cab:  
'The speakers in the 412 are the same set-up as mr Zakk Wylde uses - 2 x celestion G12 in the top and two Jensens in the bottom. I cant verify exact models without removing them. The cab itself is a heavy, dense chipboard construction. Dont confuse it with a 'home-made', this was built by a chap called Martin Nash, who obviously knew what he was doing.
dims: 30' w  x  32' H  x  13' D'
That's what they sent me...anyone think it is a good deal..
And, what pre-amps should I really be looking at, preferably valve and under £200 second hand :)
Andy!