Having made my own Spyder pedal set out of shop detritus, I'm gonna weigh in here and say that FS Beetle/Spyder set at $500 is probably a damn good bargain.
Yes, it's a Beetle set with some mods. Yes, you could probably fab up something similar on your own...if you're the type who does stupid stuff like that. But your time and parts in is gonna be more than $500.
The rig is not just right, which the $1,500 rig is very close to being. But the $1,500 rig requires all kinds of fiddling and fettling and welding to fit to a typical PCCA Spyder. The $500 rig very probably does not.
If you have an older Beck or TR Spyder you're set up for the Beetle pedal set and that would bolt right in. The lower tube extending the clutch pedal looks thick enough to hold up fine & it would normally sit under or just even with the "floating floor" your Spyder uses (of course you do have a floating floor in front of the bulkhead if you're in the market for correct looking Spyder pedals). Paint it black and it'll disappear.
And if that lower tube flexes? You bolt a brace to the floor near the L-bend with a bushing for it to pass through.
Overall, nice product, 9/10.