I tried to find where you posted two? questions? No luck.
I will take a crack at this one.
Where exactly does it say what the one hundred and forty four thousand are doing?
They are working for their salvation. Do you want scripture to back that up or are you talking about something else?
How can those Saints have works that follow them when the Judgement Seat Of Christ is past?
They will be judged on the basis of works at the White Throne Judgement.