Soncino is 140 cm on a square 48 × 48 cm base — a mid-height tower with five levels laid out as a staircase rather than stacked vertically, so a cat steps up instead of jumping.
An ear-shaped bed at the top
30 cm across with a 10 cm rim. The rim is the useful part: a cat lying in it has something to lean against on three sides, which is why cats choose bowls and boxes over flat boards.
Two condos of different sizes
45 × 30 × 25 cm and 30 × 30 × 25 cm, with the upper entrance measuring roughly 17 × 21 cm. Two cats can take one each rather than negotiating over a single box; the larger one is wide enough to stretch out in.
A bowl hammock, not a flat one
30 cm across and bowl-shaped, so it holds a cat rather than pulling taut under it. A 32 × 18 cm ladder handles one of the transitions between levels.
Posts 6.2 cm across
Thick enough not to flex when a cat sets its claws and pulls back with its weight — which is the difference between a post that gets used and one that gets ignored in favour of your sofa.
Fifteen kilos, total
The figure is a total for the structure rather than a per-cat limit. Read it as two average cats comfortably, three small ones at a push.
Setting it up
Around 50 minutes for one person, on a thickened 48 × 48 cm base plate, with an anti-tip strap supplied. Particle board under 100% polyester plush.