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 arrives into 2 terminals in SIN - highly likely SQ11 will be Terminal 3.
SQ 526 departs from Terminal 2, therefore T2 transit hotel would be advisiable, although OP may like to try the new T3 transit hotel.
Q2) Also, since the departing flight is in business will I be able to get into First class lounge? If so, might obviate the need for the transit hotel as the total time to be "killed" is probably about 5 hours. I did pay the full 140K miles for the roundtrip first class. Any prior experience/ pointers for the "conversation" with the lounge receptionist would be highly appreciated.
First class BP = First class lounge
Business class BP = Business class lounge
Q3) Does the business class lounge have showers?
I think so, yes.
Q4) I was also hoping to use an internet terminal and printer to check in online as my domestic connection (Jet airways) in Chennai is a bit tight. Am hoping the business and first lounges have printers but would appreciate if someone could confirm the same.
Not sure, but dosen't kill to ask upon arrival at lounge (if they don't have a public/shared printer, they might well do it for you anyway from their own printer/s)