Growbox in a chimney

p { margin-bottom: 0.25cm; line-height: 120%; } Hi everyone!
I'm a new grower and this is my first crop, so I have many question for you!
I would like to explain my project so I can receive from you, expert growners, advice and tips.
I want to build a growbox in a chimney, do you think is a good idea? It is big 110cmx60cm and I want to grow in it 5 or 6 plants of autoflowering purplehaze. The dimensions are enough?
if I put a hps 250 watt lamp (35000 lumen) it's ok?
Can I avoid air extraction system using the aspiration of chimney?
Thanks for all the answer!

Might be difficult to water, move light if needed. Too adequate air circulation.

Try it and see. Wouldn't germinate all your seeds at once though, until you see progress.

How is Santa Claus supposed to deliver the toys?

I have not done the cm to inches conversion- forgive me. Otherwise I feel like this could work if you can just vent freely up the chimney?