Hey, that's looking good!
I agree with hotwheels; I try to place the engine so that there is just enough room in front of the firewall to remove the bellhousing bolts, usually 2" or so. It appears you have plenty of room to move it back some without encroaching on your foot room too much, and it would probably look a little better too. But it's all your personal taste: where do you like it?
And as far as ergonomics go - hey, if we wanted comfort and safety we'd all be building Volvos!