you need to loosen the front panel to screw in the 4 screws to the case, so your answer is no you can't mount 2 x 140 fans without removing the front panel. check this out in youtube https://youtu.be/olvT3BPraf...

you can put 3 x 140mm fans in but you'll have to lift off the front panel and remove the drive tray at the bottom.

if you put 2 x 140mm then you'll need to lift off the front panel to screw in the top fan

I hope this is useful to you.

I also love this case

Yes don't worry, I think you can actually remove the panel delicately. It can take 3x120mm fans in the from or 2x140mm. Very good case I love it. For cleaning it i just use the vacuum cleaner on the from panel.