Rest assured I wouldn't do that! While its incredibly and immensely easier for me still to get an ATX PSU here and I bet other countries, about 1 year now we have some stores that sell those here
I have to agree, the whole idea is to get whatever percentage of cooling possible with everything that is available, even if its a 0.5% its worth if its maintaining the design philosophy.
But as you can see that despite thinking of the convection action, I also thought and applied the tunnel effect that this will have, that's why there are 4x fan mounting holes, with 3x usable with the SFX PSU.
And sincerely, your opinion matters (and the other forumers as well), you have more experience than me and if you have any critique or advice I would be very thankful.
Nope there won't be any venting holes, aside the bottom of the case and the top.
Yes! Those will be provided with the case! the plan is for 2x HDMI and 1x Display Port. So you can connect easily on the back of the case.