I'll be interested to see what responses you receive.
Unless somebody has actually done this, I would hazard a guess at a 3" box section, with 1/8" walls (75mm x 75mm x 3mm) and see if it flexes.
If it does, either keep the material for the future, and go up a size or two; or weld on some reinforcing angle iron.
Regards
Mike
__________________
Presently
2004 75 CDTi auto Connoisseur Tourer - White Gold
2001 75 2.5 auto Connoisseur Saloon - White Gold
Previously
2002 75 1.8 auto Club SE,
2000 75 1.8 auto Classic SE (Company Car)
1997 420 (Company Car)
1996 216 cabriolet,
198? 213 VDP
1986 SD1 V8 VDP,
1968 2000TC,
1966 2000.
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