not saying this is what everyone does but this is what i did....
fully weld the joints of the BR1/BR3/U3 & same on drivers side then i ground flat the points where the diagonals D1/D3 etc meet these points so that you get a very close mating of the surfaces for when you fully weld the chassis, if that makes sense too
same idea at the SB1 area too.
as for fully welding, do this when everything is tacked into place & you,ve checked all measurements are correct using page 38 & 43 & 45 as dimension checks.
Ash G has suggested that to get a weld into a tight area such as where D1 meets BR1/U3, then to have a spare welding shroud & carefully squeeze the end enough to allow easier access with the welding torch but don,t allow the welding tip to touch the squashed shroud.
hope this helps.
andy
