Bay Window Bench Seat With Built-In Storage Cabinets

We have a three-panel bay window in our dining room and want to turn the alcove into a built-in bench seat with concealed storage. The window recess measures roughly 96 inches across the outer walls, with the two side panels angled at about 130 degrees to the center pane, so the bench frame needs to be templated on site rather than built from a flat drawing. We're looking for a carpenter who will come out, take precise measurements of the alcove including the baseboard height and any window trim that sits below the sill, and build a template (cardboard or thin plywood) before cutting the final plywood carcass.

The bench should be about 18 inches deep and sit at standard seat height, roughly 18-19 inches from the floor to the top of the cushion. Underneath, we'd like two or three hinged-lid compartments rather than drawers, since drawers would need clearance we don't have with the radiator directly below the center pane — the radiator will need a removable or vented panel worked around it. Lids should have soft-close hinges and a lip or finger pull rather than hardware that could scratch the cushion fabric.

The face frame and any visible edges should be finished to match our existing baseboard and window casing, which is painted white MDF trim, so either paint-grade poplar or MDF face panels primed and ready to paint would work. We'd also like a simple bead-board or shiplap panel on the front of the bench to match the wainscoting already in the room.

We already have upholstery fabric picked out and a local upholsterer lined up for the cushion once the bench top is built — we just need the carpenter to deliver a finished box with a flat, properly supported top (plywood substrate, not just the lid) that the upholsterer can work from. Please include your approach to templating the angled walls, the hinge and lid mechanism you'd use, and a rough timeline in your proposal.