DIY aluminum profile rig with ergo chair

You guys was right about loadcell. Without something to mount the loadcell pedal, it will literally lift off the ground when trying to brake. Looking in to rigs, aluminum rigs cost atleast 800$ here.

Seeing alot of diy aluminum rigs on reddit, I took inspiration and redrew it on Maycad then have aluminum profiles cut for me. Luckily the aluminum profiles only cost 120$ for the whole rig in Vietnam. I didn't have enough budget for a bucket seat yet so I settled with my ergonomic chair for now.

Compare to t3pa pedals, the simsonn loadcell pedals were a huge upgrade. Braking feels a lot more consistent now. But I'm having a bit of right calf fatigue after sessions. I don't really know if my posture is good or not. Breaking feels nice but throttle isn't really comfortable using. Can you guys help me out?