Open base cabinet shelving for my office craft room: Help!

I am going nuts. Here is what I want for storage in my office craft room space:

• Base cabinets with open shelving that are 24″ front-to-back (like kitchen cabinets), so that I can add a 25″ deep work surface counter on top.
• The overall installation needs to be 36″ high – also just like a kitchen.
• On legs.
• The inside sides need to have those little pegs on the side to you can adjust shelf sizes. I’ll add brass grommets.
• In my dreams, chunky natural wood frame, with white shelves.
• In my dreams and here’s where it gets really complicated:  I’d like the design to allow me to adjust the width of the shelves and back and therefore, the width of the cabinet to fit the exact dimensions of my space. Like: The legs and side pieces would be a fixed depth and height (24″ deep, 36″ high with the legs and counter). The width of the shelves and back (if you wanted a back) could be adjusted easily by cutting down the shelves or using different sizes of shelves.
• Affordable — considering I am talking about a simple wood frame, and am fine with piney legs and MDF shelves.

Kinda sorta like the Ikea Varde freestanding kitchen cabinet unit above (now discontinued but see Ikea kitchen islands section for proxies available today) — but my design need to be shelves only and needs to be infinitely adjustable in width. Haha, that’s all I need: “infinitely.” Does anyone know of something available to suit my needs?? I have already spent, like, 30 hours online looking, and I am finding it’s constitutionally impossible for me to “settle“.

So far, the closest I am coming is the idea of using Ikea Akurums (1) in plain white (2) without the doors (3) put onto natural wood legs and (4) somehow, further framed by me in some kind of wood, to get the white-within-wood effect. However, this does not allow infinite flexiblity, as the Ikea Akurum shelf-only cabinets go only up to 24″. Also, I am not too keen on going the Ikea route. Ingredients of these pieces include and I quote: “Particleboard, Polypropylene, Melamine foil, Fiberboard, Acrylic paint”. I an not anti-plastic, just anti-plastic in this particular room quest. And third, even at “just” $70, this Ikea cabinets strikes me as overpriced compared to other items on their site. I think that because it’s called a “kitchen cabinet” the price is about $30 too high. For plastic, and those legs are even extra…

Meanwhile, I am doodling a design of my own — one that tries to use stock lumber and woodworking pieces — even though I have never tried to design furniture before.

Do you know of anything out there that might fit my demanding criteria??