Yes, I have a long aluminum ladder similar to Yours!Wilhelm, do you have a ladder you could use? it works very well for a straight edge for the first cut.
Once I've removed the screws and ladder off that 1/4 round slab end, ill put it up on saw horses and I'll try to mill a one inch thick board off it. Or leave it one-sided and I'll save them for stair treads Or shelves. Don't get too caught up about how much material you remove on that first cut. It can be cut again or used for something decorative.
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