Bulkhead for the RSJ won't be a problem to be honest. I was more wondering if it something to be undertaken yourself or get somebody in to do it. My old man did my nans one many years ago and that, AFAIK, is still standing
He's a fairly competent builder and my neighbour works for Tamdown builders so I'm sure he can lend a hand if need be. Actually, the more I think about it the more I realise that it shouldn't be a problem as I know quite a few handymen (all biking mates before anyone slips in with the dodgy comments
)