Ok how about fencing?
I also do playgrounds football, field hockey, soccer (etc) all sports goals, benches, picnic tables, basically all the outside stuff for 99 school sites, also you must be able to qualify as a CPSI withing 6 months of employment.
As for welding we do arc, heliarc, mig tig brazing plasma cutting, and general machine shop work.
I think the yard super has a requirement about being able to forge a ball peen hammer out of a RR tie LOL.
(btw CPSI = Certified Playground Safety Inspector)