/diy/ - Do It Yourself

This may be a better fit for /sqt/, but here I go anyway.

I am creating a L/U shaped part (a handle for a small rotary cutter), pic related. The dimensions are about 12x10 cm. One of the three holes at the bottom will hold the blade (haven't decided on the position yet), and I will press down with maybe a third of my body weight (direction of the arrow). Maximum thickness is 6 mm.
I was thinking of getting a 12x10cm piece cut off from a sheet of metal and taking out waste material with an angle grinder and drill the holes with an appropriate bit.

Now, I'm wondering which material to use and what thickness.
Concerns are mostly stability and ease of machining, considering I only have drill bits of questionable quality with hand held drills and an angle grinder available. Of course I don't want to pay an arm and a leg either.
First thought was to just use 2-4 mm thick stainless steel or whatever other bog standard material I can get at a local supplier. I'm afraid Aluminum will be too easily bent when I lean on it with too much weight.

Does that sound reasonable? Any other suggestions?