I've constructed an O gauge inspection pit from the free Scalescenes download to sit under/out front of the small engine shed. Only problem is that the Black Cat Technology OO gauge lighting units will not fit!

Never fear dear reader, they also do a universal set for six quid that can be split up and made into whatever shape you want. Twos sets were bought and the bits of PCB sellotaped to a print of the pit sides for assembly

and here's the result late at night ....

I can see me using quite a few six quids worth of Black Cat Tech's goodies on the layout