i am planning an up coming trip to SIN Changi Airport and any help would be appreciated -

there seems to be some conflicting information concerning *G lounge in singapore. from what i gathered, as a *A gold, flying Y, i will be able to use only SATS premier lounge. Will i be able to visit more than 1 lounge/day? since they issue lounge access vouchers, i probably can only go to one lounge/visit, rigth?

if my flight departs from terminal 3 (UA/CO), will i be able to use the SATS lounge in terminal 1? can i easily go from terminal 3 to terminal 1 and back after clearing immigration? it sounds like i am departing at 5:30am (TG lounge will be closed) so my only options are the SATS lounges. is there anything else that might still be open in those hours?