neither require anything but rocks 2x4s and nails. (and in the case of the travois something to make rope out of)
stone/makeshift hammer = stick/2x4 + 1 rock/metal chunk + 1 rock/metal chunk/anything with hammer - 1
then you have a hammer for nailing your makeshift sled together. nothing else needed.
You can literally:
1st (or less?) in-game hour sled from nothing | warning EZ mode inside
start a fresh shelter start game,
run out and grab the nearest rock
smash the benches for 2x4
wield 2x4 and use to smash lockers
craft makeshift crowbar out of pipe
smash everything else inside bunker
craft 2~3 lockpicks for fabrication lvl 1
close and tear down bunker curtains for long string
craft makeshift/rock hammer
craft 2 frames (or frame and light frame for travois)
and be good to go.