This traverser could be just right for these plans; takes 3 coach trains easily.
https://www.ebay.co.uk/itm/383357054818?hash=item5941dc6f62:g:LWsAAOSwWkdeEwGZ
B&B couplings are my favourites. Looking for a clean way of using them with NEM pockets. Wondering if there are adapters around which could help with this. Ideas?