In a word Yes. You are not cutting out to accomodate the drainer, the
cutout is to allow the lip underneath the sink to fit into the woktop for
clamping purposes. I don't think a sink has been invented yet that can be
fitted to a 'partially' cut out worktop, but I could be corrected any minute
========================I think you could probably cut a narrow groove with a router just deep
enough (about 3/4") to take the lip of the sink top. This would leave the
part of the worktop under the drainer intact.
You would also need to cut a few large holes (with a 'Forstner' bit or hole
saw) to accommodate some of the fixing clips.
It would be worth doing a dummy run on a bit of waste chipboard or similar
to see if it will work.
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