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[TomH121]

Would appreciate hearing from eljefe.

PLEASE see my attachment.

[eljefe2 · Accepted solution]

From the look of your diagram I would say yes, you can do what you want to do, and it will indeed improve your wifi coverage upstairs. 

[TomH121]

Thanks for your prompt reply.

Expecting SANTA to deliver the Network Extender.

[eljefe2]

Sorry you have to wait that long.

Once you've installed the extender and tried it out, come back and let us know how it works for you.  That may help others going foward.