Leather ring binder diary: refill block, my own ruling

I keep my work on paper — meetings, invoices, notes from site visits — and every ready-made diary I have bought failed on the one thing that matters to me: the ruling. Some hand the whole spread to a single week, some print an hourly grid from nine to six, and my days start earlier and finish later than that. So I would like to commission a leather ring binder a little smaller than A5, with a block I can swap every year and pages I can reorder whenever a job changes shape.

The layout is my own. The week runs across the left-hand page in day columns; the right-hand page stays completely blank for notes — no grid, no dots, nothing printed on it. I want several tabbed dividers, a pocket for business cards and a separate one for receipts, a pen loop and an elastic closure so the book does not fall open in a bag. Dark brown vegetable-tanned leather, with my initials blind-embossed on the flap.

Three things I would like settled before anything is cut. The ring mechanism is a consumable: over the years it works loose, the rings stop meeting and begin tearing the punched holes, so please plan a spare mechanism from the start and mount it so it can be replaced without taking the cover apart. I write with a fountain pen and ink bleeds through thin paper, so the paper weight has to be chosen for that pen and tested on a sample sheet before the first block is printed. And vegetable-tanned leather darkens and takes on a patina over time — that is the normal course of things, not a defect, so no bleaching and no plastic topcoat.

— format a little smaller than A5, six rings, cover in dark brown vegetable-tanned leather;
— you print and punch the first block; after that I need a print-ready template so I can run the next ones myself;
— ruling: week across the left page in day columns, blank right page, plus loose sheets for lists and invoices;
— four tabbed dividers, card pocket, receipt pocket, pen loop, elastic closure;
— a spare ring mechanism included, fitted so it can be swapped;
— a paper test with a fountain pen before the run: no show-through, no feathering;
— initials blind-embossed on the flap, no foil;
— up to two weeks; please send examples of similar work and an itemised quote.