It's not uncommon for two people to have a similar idea independently, e.g I posted some stats about how well we do when Hemed and Baldock both start - a few weeks later there was a similar article in the Argus.
If you could relocate the stuff I previously mentioned AND the plant/stores/offices etc then the red bit is about all you could add.
Another monkey maybe ???
There isn't that much space to extend the North Stand further back as there isn't much room between the back row and the roof at the east end.
If you go further back this will only get worse as the beams are slopping that way so they'll soon converge. Increasing the angle of rake would only...
If you change the rake angle you have to change it for all the lower tier the whole way round, which you don't want to do.
Either that or you have a wall like the home end at Charlton or at Stamford Bridge.