I made this 10 years ago. Not a boom but moves logs and may give you some ideas. Used a tractor draw bar from TSC and some angle etc.
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Put an over the center type latch on my tongs to hold them open.
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And a rope pull to latch open the tongs.
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I made this short video the very first time I tried it.
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electric or hydraulic?....adding a winch into the mix...
It will be electric and it will be nothing larger than a 3500LB.electric or hydraulic?
I think both are pretty slow but if you go electric, upgrade your alternator and add a couple deep cell batteries to the mix.