Q1) The SQ helpdesk couldnt tell me which terminal SQ 11 comes into nor which terminal SQ 526 departs from which leaves me in a quandary as to where to book the transit hotel (if different terminals) . I'd appreciate if anyone on here has that info.
SQ 11 should come in to T3 , T3 has a transit hotel Airside , there is also one at T2.
Outside Terminal 3 , there is also the newly opened Crowne Plaza Hotel.
The trams between terminals stop running at some point , but it should be fine for your arrival, I believe they stop at like 230 am or something like that.
You can always walk and use the travellator (people mover) between terminals if you have to when the train is not running.