i don't have my SG to hand so i'll describe it:
hand built by martin kemp, with celtic rune in head stock
oiled mahogany
sweet sounding single piece body
dual p90s (kent armstrong 'hot' p90s - ahem, but sounding quite nice due to the body i think)
ebony fretboard
great 60s profile neck with big fat frets
the construction is a little bit unusual, and has some quirky features... its also a bit wobbly in places. i heard martin kemp was a bit of a mentalist, and since moved to thailand.
i changed the tuners and put a small hole through the head stock - man i was angry!
later i took the p90s out to see what they were (was thinking of some bkps maybe) - when i put them back i screwed too tight and put a hole through the body... i was even more angry!
with a bit of superglue, you can't really tell now though. i still wince when i think about that.
it sounds something in between 'live at leeds' and 'black sabbath'... basically its a very cool guitar. i like the quirkyness of it, the 'raw nature' of the oiled finish and my favourite pickups are p90s too - if i wasn't so flying V obsessed, theres a case for arguing this is my best guitar.