won't the bands want to use your modular??? are you trying to hide it from them? hahaha

They may, but the thought of most musicians using my modular gear is terrifying... :P

Plus, my studio is not a dedicated synth lab. Every surface/rack/shelf/piece of furniture increases the complexity of getting things to sound the way that I want them, so everything that is not being used needs to be easily able to roll out of the room. I spend my life moving speaker cabs, amps, mic stands, racks of guitars etc in and out of the studio :D

I think the b-company sell a knock off version that's cheaper...

Yeah, they probably do, and it'll likely be fine for what I want to do. I should still investigate making my own as I might be able to save a fair bit of money.

What bands are going to want to record using your eurorack modules?

Hopefully none of them. Putting shiny toys in front of guitarists or drummers is rarely a good idea. (a) they break and/or try to lick everything they see, (b) they suddenly see 'options' and want to put modular sounds into every song because x band did it. 6 months later they are still in the studio...

Option paralysis is a really problem for a lot of bands, so there is no point creating that problem for yourself. 90% of the time bands simply need to record the material that they have already rehearsed, not add last minute changes based on whim.

And you are doing them a favour too. Studio time is not cheap.

I realized quickly that being confined to 19" in width wasn't ergonomic for anything over 5 minutes of noodling because I had to stand as well as bend down to reach anything not at eye-level

Yeah, that was a compromise that I had to make to get the lowest possible footprint, mobility and co-location. I figured that I'd mostly work on approximately 15ru at standing eye level, 15ru at sitting level (30 out of 42ru), and use less accessable lower levels for shelves, draws etc.

I was originally considering multiple 10 to 15ru racks, and even bought a couple of 10ru stackable/modular racks. While I like that I can use these either stacked on their side or upright -- with the modules facing me (horizontally, like a table top arrangement) -- they are far too deep (60cm) for my liking. I am now using them for my rackmount amps, with a compressor, EQ, limiter and gate in each rack, but also as mobile power outlets over the far side of the studio.

I used to have the four post type (like the one you are talking about), but found it's footprint to be far to big

I was originally looking for something other than a 4 post rack (such as a 2 post telecom rack), but actually found this one to have the smallest footprint (that was actually my primary criterion, along with having castors). It has an adjustable depth, and can either be 51cm or 41cm -- the depth I will use -- which is nice and thin. I was surprised that a 4 post rack was the thinnest option.

While using a rack intended for 19" rack gear is an odd idea

I find it interesting that it is only online that people find this odd. 80% of people that I know in real life use 19" racks, and the other 20% are aware of it as an option or have used them before. It must be a regional thing.

Or perhaps a live use thing? Being able to pull rows straight out of the studio rack to plug into travel racks/flight cases is a huge advantage.