Hi
What make is your lathe? It would help us to know.as someone may have the pulley you need for your bandsaw attachment
Have you tried to screw your chuck onto the spindle as it may not fit as you might need a l/h thread?
If this link works...
Also consider how heavy are the intended contents?
Ensure the bottom of the drawer is securely fitted to the sides or it will sag or maybe pop out - perhaps there is toom for a supporting rail to go underneath the drawer to keep the sides together and stop the sag
I suggest if you have the cash buy a dedicated disc sander and sell your existing for a few pounds.
I have both they are old machines but do the occasional job ok - good enough - but I see a problem in cannibalizing your existing as the new sanding disc will (?) be overhanging the bottom of the...
A chair manufacturing factory? But the cost would most likely be prohibitive
Depending on how many you need buy some used chairs and reuse these parts
Ask a local wood/joinery shop for a price
Without wanting to start the thread going around in circles :)
I don't know what I don't know - unless someone told me something I didn't know before and then I would know one thing I didn't know I didn't know