@dogberry It is not madness to have a plan in mind for Four Tonearms, it is a little unusual to have four in use consecutively, but definitely not unusual to own Four Tonearms and a selection of usable Cart's to match that number or more even.
I have owned and used approx' Nine Tonearms to get to the place I am today with a Tonearm.
Today with only one Tonearm in use, I still have a selection of Seven retained, along with LOMC, HOMC and MM Cart's, all with a usable number of hours left on a Stylus. I don't know how ageism may be affecting some through the time in storage.
As for the offer for the Permali, the offer is for a piece of the size that would be able to be turned into a Tonearm Pod, that by design, when finished will be able to be stored in a cupboard when not in use, or only be as intrusive as a Black Brass, if kept in use.
A Slab to not be accepted by SWMBO will be very expensive to send onto you.
I was given my own room without any dispute for the HiFi, it was like an approval to go off the scale with madness. To get the idea, the Power Amps are seated on a 250Kg slab of Granite. In the Room I would refer to that one as adventurous.
There are more quirks to be found.