It'd be a lot of work, tie plates aren't that big and you'd have fun keeping it flat while you welded all those pieces together.
I'd suggest finding a couple pieces of really heavy "I" beam to help hold them flat while you weld. Then I'd stagger the joins so there aren't any table length welds. maybe I'd put this first on the list.
Before starting I'd estimate the cost of the welding rod and grinding disks, even if my time doesn't matter. Believe me I know what it's like to have more time than money and doing it myself rather than having a pro do it instead.
Are you going to leave all the holes or fill them and grind smooth?
Frosty
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