If you cn weld ally ok, can you not unpack your welding kit and save yourself £220?
A morning's work, say about 4 hours - £55 an hour does seem quite steep yes. Welding consumables really won't be much.
Up to you if you want to fit a steel sump. If it's good enough for the donor.... ?
That ally looks quite thick, would it be possible to drill and tap some blind holes and clamp on a fabricated blanking plate with a rubber gasket behind it? Just an alternative idea.
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