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A few thoughts and overheard guidelines.
Is the size of a fillet the length along a tube's surface or from the tubes' corner to the concave point closest (this "thickness" of a fillet called the "root" size by some)?
I have read of a 3X dimension for a weld fillet to be as strong/still as the tubing is, as in 3 times the tube wall. But is this also for brass fillets? Is this a "root" or a tube surface dimension?
For bonded joints I have read of figuring out the interface surface which will be bonded and do the math with the bonding agent's tensile strength. Compare to the tubing strength.
I have always considered a lug to be of massive over design when it refers to a socket depth/tube strength relationship. While the long and sexy lines of a well done long point can be intoxicating, add cuts outs and watch out, the brief skimp of a bikini line can be breath taking. Andy
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AndrewRStewart