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I have been having such fun building the small desk rack that I'm tempted by a large desktop installation. The 2013 SoS article on Eurorack included a few shots of the author's setup, a classic three stepped tiers and base unit, as right.

I could produce something similar at about zero cost - I have plenty of plywood, a spare Doepfer power supply, a Zeus for the base power and a lot of rails, not be mention dozens of modules not currently in use.

Alternatively I could use the new Thonk rails and Lamond side pieces and build 150HP wide. Four pairs of 150HP rails plus threaded strips and Lamond sides would be 4 * (£31 + £11 + £12 = £54) = £216.

In 104HP it would be 4 * (£21 + £9 + £12 = £42) = £168.

And in 84HP 4 * (£20 + £8 + £12 = £40) = £160.

Clearly the 84HP isn't worth considering unless I use existing rails. 150HP is tempting.

84HP is around 17 inches, 104HP 20" and 150HP 30".
Modules are around 5¼" high and so three rows of 150 would be 16" high and 30" wide: that might look a little stumpy. I could not justify 5 rows of 150HP plus base.

There's some good information here from Stefan Burbulla.

If I start small and cheap, I can always rebuild more grandly and extravagantly later and so (subject to finding and evaluating the rails I have in stock):

• three rows of 84HP plus base;
• configuration will be a smaller version of the standard synthesizers.com cabinet, i.e. two on the slope, one upright and keyboard garage below.

I'll need to find out the slope angle. The size quoted is 48-3/8"w x 14-3/4"d x 18"h. The single upright row is 8½" deep.
The depth of the garage will have to be sufficient to house a base with suitable skiffy modules and at the same time the slope of the bottom rail will have some effect on the depth of modules it will hold.

[27 Aug] I have a location 18" high and 30" wide: the Mondrian/Rietveld desk.