No it won't put him in extreme.//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif
As for the box the way the port opens up like that then gets smaller at the port mouth may have some negative effects.The widest part should have been at the very end,with the way you have it layed out there will be lots of restriction at the opening since its so much smaller.
If he got this design from who I think he did, this should be fine, and probably meter well.//content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif