I'm hoping to start a new bedroom scheme soon upcycling some old pieces and your project is an inspiration.

I found an indentical one on gumtree but like you couldn't find a price as it was sold. Personally I'd reupholster it in a very similar fabric (is it vinyl?) and enjoy it. I'm not sure how it affects value but many antique sofas, chairs etc are reupholstered as the fabric obviously has a shelf life. I think it's fab though, any more gems?! I don't know if this article helps at all https://blog.thehighboy.com/what-to-consider-when-reupholstering-antiques/

I agree with @Daisy England regarding drainer grooves are not necessary, in fact the amount of fall is so minimal and so little water drains away you might find having the extra worktop space is more useful, there are worktop drainer boards https://www.victorianplumbing.co.uk/reginox-ceramic-belfast-sink-kitchen-drainer you can get instead which may be more practical. Adding drainer grooves to wooden worktops may invalidate the guarentee so check the small print, you have solid surfaces like mistral, minerva which are solid all the through, but they can/do scratch quite easily (es[ecially the black/dark colours), solid laminates worktops but these usually have a black core so if you add drainer grooves you lose the worktop pattern. If budget can stretch quartz/granite would be a preferable option and just put a tea towel down on the worktop to soak up the water.

Looks amazing. Was it hand painted or spayed?