Does anyone have any suggestions for a durable finish that will not
noticeably scratch and protect the surface? Including from an
accidental fluid spill?? All suggestions welcome.

Check out - Behlen Rockhard Table Top Varnish

A few sources:

http://www.woodcraft.com/family.aspx...fcode=05INFROO

https://www.highlandwoodworking.com/...OD&ProdID=4292

http://www.rockler.com/product.cfm?Offerings_ID=17265

I've got no financial interest, blah, blah, blah ...

Joel