Painting 'stooges' as requested...

For control surfaces; drill holes in 3/8" wood dowel for big T-pins, CA heads in place, press control surfaces onto protruding pins. If they loosen up, then bend the pins a little crooked next time you push the parts on.

For fuselage; glue/screw a 'engine simulator' plate into slotted end of a 1" dowel (or an old broom stick!), bolt plate onto motor mount. Hang from PVC pipe strapped to ladder or suitable. You can wrap the broom stick or dowel with tape to get a friction fit in the PVC pipe if needed.

For wing; this will depend on how your wing mounts to the fuse, in this case there are two forward dowels and one aft wing bolt. I attached a front wing mount interface plate to the end of another 1" dowel, drilled and tapped the dowel for the aft wing bolt and added a spacer to keep the stooge away from the top of the wing. Again, this is hung off the PVC pipe strapped to a ladder.

See attached pics...

Cliff