To be short: no, you can not take them apart. One of them had tipped over at the previous owner when he removed the electronics, causing the wood and ESL elements to separate. Luckily for me the ESL elements all survived the impact (excellent quality), but the wooden panels came apart. Because of the curved design it was very difficult to get them all glued together again (front and back). So be careful when you remove the electronics. They become very unstable without the counterweight of the trafos! On the other hand, the panes were clean, no dust or dirt on them. Even after 40+ years! So I don’t think cleaning is necessary when they have been in a non-smoker environment. Attached pictures from the ESL elements before repair.
//Jean