Update: minor project documented upthread finished! Spade bit countersunk hex bolt head and washer are used where particle board material doesn't meet carriage bolt requirements. As the name implies, they were meant to be used in an application where really solid, tightly grained, first growth wood was available.
Both types of connectors inverted for setting heads sub-surface.
In keeping with the use of materials on hand a/o repurposed, I now have a useful storage spot for my bathtub painting workstation:
Rolling base snagged off a ratty chair next to the recycling bin.
I make use of shims for all kinds of things, here they're used to level up the slanted surface of the chair base. Detail of edges of a pair right out of the pack and one set I hacked for incremental adjustments/fine tuning more exacting use cases.
Rolls nicely under the drop frone desktop of the HackHutch. It has been doing yeoman service as a rolling tool/hardware cart for the ToolboxMonster's rolling base. When needed, clear it off and unbolt the paint setup. One thing no longer cluttering up my walk in closet!
________________________________________________________________________
This one deserves a bit of documentation on its own, meet my "gotta have a better router table setup immediately" and no place to store it after use solution. Secondary use of the bathtub paint board. Ear protection definitely required, but cleanup's easy after using it for fine work/small parts when it's too hot/cold/rainy for fiddling with settings out on the terrace.
Still working out dust collection setup for router and oscillating spindle sander. Clamping a board to the surface is a snap. There's a roundover bit in there now that needs no fence, we'll see how and where things go. One of my routers has a nice custom storage space as a bonus!
Documenting the MadHacker's kitchen pantry as I go, truly insane setup and content capacity. That's where the sander, now dual purpose tool setup lives right next to the 14" Bandsaw.