I dunno…. I started to do the “lasagna bed” deal where you lay down cardboard as a weed barrier then carefully layer carbon rich stuff and N rich stuff on top of that.

It worked after the first season but why bother? I have a lot of compost. I would have saved time by just piling it on top of the cardboard to begin with.

I think it would be fair to say compost can be overdone in a container.

I agree with you, klem1. Speaking from experience; it dries out too fast.

Ok, save the act of composting for the ground-- got it. How about some advice on how [often/much] to add compost/nutrients to the container? Should I take from the compost pile every now and then and work into the container soil, to add nutrient?

Thanks for comments so far.

Compost is a weak fertilizer, and better used as a soil amendment for tilth. You'll fertilize that raised bed like you would other container plants.

Is this bed really two feet deep on four foot legs? Do you garden from a ladder?

Ha ha. But still wondering how even a 6’7” person can garden at a height of 6’. Aren’t your plants at nose height?

I've been growing squash at nose height for years. It make's easier to spot squash bugs hiding on underside of leaves. (*_*) NOT! I think 4' is the width and/or length.

OP said the legs are 4’. The height and width are 2’. I’m thinking of the difficulty of actively gardening ie cultivation, weeding, feeding etc, at head height, not to mention the original idea of composting directly in the container. I’d love to see a picture of the set up.

That went right over my head---as would that raised bed.

Lol! The container is 2 feet deep, and the legs are 4 feet tall, but the leg top starts at container top. I see now how I described it though. Sorry, I was talking as the builder who remembers measurements of all pieces. Anyway, perfect height for me. 
Attached is a pic of the beds, a work in a progress.

Can you spot the dog? The reason I built containers above ground...

Shi-Tzu ?

All becomes clear..... I was envisaging the surface being 6’ up in the air ie the 2’ depth plus the 4’ leg!