For the stanchions/legs/struts in each corner I've used surplus 18 gauge inch-square aluminium of a length of around six inches, allowing this time for just one tube insert viz. M6 threaded at the bottom end. At the top end the alloy tubing runs flush to the uppermost reach of the three-way connector.
At this stage if you've people over for dinner and you are able to persuade them that it's a genuine Bauhaus coffee-table, then sell at a profit and get out while the going is good.
