I was thinking I'd just scribe the top plate where the manifold edges are, then measure over enough for socket and bolt holes, and go in a little more from there. Then I could just take an oversize flat plate and have it overlap the areas I left protruding past the manifold sides, drill and tap a few screws to hold the cover in place, and voila!
Then I'd have a rectangle cutout in the top plate, but it would still be all one piece.
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