Custom tandem builders in Europe for anyone looking for a triple or quad
 

here is my list of tandem builders in europe that will be a triple or quad, some will build a quint.
1.kinethic spain https://www.kinethic.com/tritandem/ will build upto a 5 seater upon request, unknown if they do s's couplers.
2. pedalpower germany https://pedalpower.de/tandems-triple.../classicsteel/ made a few quads in the past will build triples as far as i know, they do coupled triples and non coupled triples.

This is all i have for now i will edit this in the future when i find more builders.

Thorn (part of SJS Cycles) make a stock tiriplet, UK-based: Thorn Me 'n' U2

i knew of thorn since i own an adult trident triplet thorn, i didnt know they still made the adult child version, i do know they no longer make the adult triplet.