Time to re-visit this one I think.
Proposal is :-
One 3m length of kitchen worktop, 600mm wide by 38mm thick, from B&Q who
can be persuaded to cut as 1m + 2m I'm sure. This needs to be a pickup from
store, as they sometimes have scratched ore otherwise marked lengths at
Assorted lengths of 4"x2" timber, from anywhere, probably planed, unless
anyone wants to do a lot of sanding.
Assembled as :-
One 1m bench, 4x2 underframing attached to middle of one long wall in main
hall, fitted with 4" engineers vice at one end for metalwork and
woodworking vice at the other end. (Consider also fitting a small bench
drill in the middle.) Wall mounted rack to carry hacksaw, junior hacksaw,
spare blades for same, and a tenon saw.
One 2m bench in secure workshop, position to be decided.
This would mean that most small jobs could be accomplished without needing
access to the secure workshop area.
Cost for benches about £100, plus cost of vices, tools etc.