I’ve had the parts to do this for a few months now. I had to empty the vac and clean the filter the other day so I figured, while I’m at it…
I used my heat gun to get the PVC tubes to fit over the accessory holders in the feet. 
I made some round plugs to snugly fit the inside diameter of the tubes from some scrap MDF on the band saw and cut out the hole for the bucket with a jigsaw 
Done.
So I got the pipe and elbows needed to connect the vac and second stage more efficiently. I also freed up my longer hose to use as the intake. 
I also added some pins to wrap the cord up with and some handles.
FYI, that’s a Dustopper from Home Depot.