I have rigged up a sawhorse to hold my small 4hp Mercury but don't trust the basic design to hold a 60hp Mercury.
I've made a couple with 4x4s for the uprights, 2x4s for the supports and 2x6 or multiple 2x4s to hang the motor on. I did add some boards across the bottom in the front on mine, to set the battery and gas tank on when test running. Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do.

One of the things I like about mine is that the large wheels make it easier to use on uneven surfaces. It is made to hinge so you can fold it flat when you are not using it or for easy transport.
Straps at the bottom keeps it from doing the splits when the motor is mounted and I am even gonna mount some wheels on them so it can also be used as a dolly. I'd like to get the outboard off the floor of my garage and would prefer something I can make with wheels.

I have a 900lb max weight hand truck I was going to modify, wondering if anyone's tried that as well?

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