The headroom I referring is 4.1m and you are referring to 3.9m. Even if 3.9m headroom is referred, your I-beam is still obstructing the lift.
I-beam should not be place within the headroom clearance. Check with Preeda & Mr. Lim which height is correct. I would suggest to go for more.
The I-beam and metal deck shown in the drawings look like a modification of KONE details into architectural drawing.