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@MrE
http://www.ebay.co.uk/itm/SILVER-BRAZING-SOLDER-FLUX-KIT-Johnson-Matthey-Ag130-x10-rods-Easy-flo-flux-/182005843945?hash=item2a6064c7e9:g:TSAAAOSwd4tTwXkU
I’ve found it flows adequately (very clean steel and more flux than you would imagine) and readily fills the sort of gap left by fitting parts made by hand (saw, file, abrasive cloth in a drill arbour)
At risk of hijacking your plan / thread: curves are also a possibility without resorting to a pipe bending jig if you want a back to your rack or safer front corners.
Twenty (ish) junior hacksaw cuts passing about 90% through the tube will allow a right angle bend. The closer together the saw cuts are, the smaller the radius of the bend. Braze up and file to give a smooth curve...
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