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Shrapnel more likelyOn taking to local a sawmill, I could be wrong but believe places who have such machinery are very wary of cutting somebody else's timber, hidden screws/fixings etc.
... how to cut the 25' x 20" x 4" plank into three 25' x 20" x 1" ...
Exactly this. A resaw is by no means an uncommon item, anyone processing largish volumes of timber will have one and it is the only way to get a nice consistent cut with minimal waste. Another consideration is dust: iroko dust is a significant irritant and anyone operating a resaw will have proper extraction, tested annually and safe for the operators. The width of your boards rules out most smaller bandsaws. Accuracy at this stage will save heaps of time. The bigger the machine the better.If you have a local pallet/casemakers near to you, they will have a Stenner resaw, this would make easy cutting and accurate, bung them a few drinks, job done.