ambitious, yes
awesome when done, yes!

you could always do the straight parts with lumber and the curve with block. Might make it easier on your hubby.

I am in the process of making 9 raised beds 4x16 of PT 2x10 lumber. Not sure if I would do it again, for one thing, its expensive. I didn't secure them and i have some warping. There are 30" paths and its made it more difficult to maneuver the wheelbarrow. Before I had the beds raised some with carpet for paths. The wood is going to look better but not sure if it is worth it...probably would not do it again. But by golly I am going to keep at it till its all done and looks good but that's my true opinion.

I made a bed with a radius like that about 25 years ago by cutting treated 2x4's the height I wanted and sticking them into the ground. The problem I had was with the 2x4's rotting out. I did not treat the cut areas and rot started there. They make plastic type of board now that is not supposed to rot. You could cut a piece of re-bar and secure it to the deck board with plumbers tape on the inside if you felt you wanted more support.

I would not go to the trouble, but that is just one old man's opinion that already has more projects than he can ever get done.

Larry

I wouldn't say it is too ambitious, but it sure looks like a lot of work! If that's the kind of bed you want, then go for it.

There are many ways to make raised beds...just mounding soil with nothing to contain it, building raised beds with side made of non-pressure-treated-lumber (the wood rots and must be replaced every few years), pressure-treated lumber, cedar and other rot-resistant woods, cement blocks, concrete landscaping stones, brick, native rock (like flagstones) or stone, etc.

I say build your raised beds in the manner than fits well with your house and your neighborhood and in a style that makes you happy.

I've linked some Googled photos of raised beds to give you some ideas about how other people have built raised beds. You'll see everything from "plain and simple" to a bit fancier.

Dawn

Here is a link that might be useful: Some Photos of Various Raised Beds for Veggies