A very warm welcome to the forum Headshot
Steel has gone up quite a bit over the last year .... The last quote I had for just the chassis tubes was £149 + £10 delivery ( Full uncut length prices ), that was at the end of last summer, daresay it has gone up even more since then
Started by using the bandsaw but soon got bored spending ages constantly changing the angle of the cut .... Ended up cutting the tubes square & cutting most of the angles with a hacksaw.
One thing is for definate.
If I were to start again, it would opt for the flat pack chassis route.
Understandably, you may wish to enjoy the challenge of cutting the steel from scratch .... On the other hand, you may be just like me & dagging to get on with the fun part of the build