The sideboard is quite charming and could be painted to match the cabinets. But, look at the doors. They leave that awkward space on either side making things hard to reach. (Not to mention you'd have that odd 5" to dust frequently to keep the dust-bunnies from colonizing.) A built-in could be designed to suit your needs. Would you sew at it, or would you put the machine on the table? If the latter, make the cabinet counter-height or higher with a stool, which might be easier to work at. Add pencil drawers for all those little pesky things. The skirt all across the bottom, hiding shelves designed to suit your storage needs, and you are good to go. Or, you could add the elements that make the sideboard charming to your built-in, like the details at the top and base (do have a base, so your stuff isn't sitting right on the floor), and you have the look of the sideboard and the efficiency of the built-in. Love that space, so sunny and airy!

We dont have one yet, just moved to a new house. But Ive been eyeing this one for a while now. https://www.restorationhardware.com/catalog/product/product.jsp?productId=prod18890271&categoryId=cat10310014

90" is better IMO based on the scale of the room, not the table.

We will be replacing this old chandelier from prior owner, most likely with this crystal chandelier from pottery barn. https://www.potterybarn.com/products/clarissa-large-round-glass-drop-chandelier/?catalogId=84&sku=5422287&cm_ven=PLA&cm_cat=Google&cm_pla=Lighting%20%3E%20Chandeliers&region_id=658780&cm_ite=5422287&gclid=CjwKCAjw4KyJBhAbEiwAaAQbEyquKgu2yAkqPJayoxoRe9Sg9NBrMI3_ZVuQubdc602UEUPHOV2uKxoCXrkQAvD_BwE Would appreciate recs on a sideboard/buffet that would match this room.