wanting to start work on my boat ...

[tsubaki]

If you haven't had experience with them be careful. The high center of gravity on outboards will fool you.
Moving them even (especially) if on rollers will be hairey.
I've made a couple for under 35hp and have 2 that will handle v6 outboards.
It's best to have help and an engine hoist to move them around while using the stand also.
If you can't find one already made to borrow or purchase at least look hard at one before making your own.