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Gday Jason
Using 4 small pieces to make one big piece would certainly work without problems. ( Its essentially what laminated wood beams are )
As to strength vs a single 100x100.
Given the same wall thickness, as long as the pieces were joined properly, it would be approx 80-100% stronger, as there will be 2x more metal in there.
Rather than bolt them together, if you can get the joints stitch welded, it will be very rigid for not much weight, and no bolt holes to weaken anything
Andrew
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