Pecanfan wrote:

Not sure yet, but say 10mm holes through 8mm RSC.

A normal drill with a decent drill bit will do this fine. If you have
lots to do, then a magnetic clamp drill will make doing them accurately
much quicker.


2. Is it possible to cut RSJs?

Yes, but far more sensible to buy them cut to the right length.


I'm just wondering if stock lengths will be cheaper than custom-cut lengths.
What would you use to cut, say, the above?

What do you have available to you? A 9" angle grinder will work well.


--
Grunff