Nice work Dan :clap: ......I hope it runs as good as it looks !!
On your next build, you may want to consider a couple of slight adjustments to your design.........hope you don't mind me making a suggestion or two.
To illustrate,I have attached a couple of shots of chassis' that I have built using the same pan attachment method that you have used.
Next time, try having the legs of your front pan support piano wire "L's" facing towards the front of the chassis not the rear.......this will add to the chassis flex. (You have faced the rear "L's" towards the rear of the chassis which is perfect).
You may want to add a cross brace to the chassis pans.......this will be soldered to each pan, but, not to the main chassis rails. You may need to solder a bit of brass sheet/tube/square to the pans so that the cross brace just clears the main rails.
To be honest, using square brass tubing as your main rails is not the hot tip in building a "flex" chassis......unlike piano wire, brass does not have a "memory", so , when flexed, it tends to bend, and stay bent, and, more importantly, it does not flex as uniformly as wire.........so brass has 2 strikes against it when building a "flex" chassis. ;)
If you substituted some .055 piano wire for your 2 main chassis rails, the chassis will flex/work better , and stay straighter longer!! :dance:
Cheers
Chris Walker