OK... loft visited and tent inspected...
Without actually putting the thing up somewhere and measuring it, it's hard to say how much space there is in the porch. I know I've stowed a big backpack in the front, but I don't know if it would take two big backpacks. On the other hand, the back of the tent unzips, though you'd have to be inside the tent to make use of the space between the tent and flysheet, as the back of the flysheet doesn't unzip. At the front of the flysheet, there are two zips, so you can roll the whole front upwards if you like.