fabricate trunking 90 degree bend from two 45 degree bends

Hello, Here is the end result of my 90 degree bend attempt. From two 45 degree bends in 50mm x 50mm steel galvanised trunking. The end result is almost 90 degrees, its out by only a small amount. For a first try I am happy. I am still looking at methods I could use to cut the metal quickly and accurately. I had been using a cutting disc and grinder which is very fast and requires more control. Damage can be done with the grinder, it requires a power source unless you have a battery tool which I do not. More care is required than the hand saw as it is a dangerous tool to use. There is more filing as well as the cuts leave sharp edges that do need removing. I would strongly recommend tough gloves when using a grinder. For this job I used a close quarter saw that I bought from B & Q for £5.50 (ish). It came with a decent hacksaw blade, 24 teeth 300mm, Magnuson brand. I am thinking about getting some of those blades as this one has held up quite well. Avoid the 30 for a £1 saw blades as they brake quickly. Here I used rivets, three different sizes. Started with the large but found the rivet tool was sticking so I changed to smaller rivets. The smallest broke when I started to tighten it up. This is just a practice piece and I intend to do more as I go. ... https://www.youtube.com/watch?v=0GIHMO0_0Ig