we did have my plans but we double checked and attached each peace carefully. i always find prottypes always take the longest time to make that day included the trip to the diy shop thougth
you could probably knock something up like that in under an hour if you had all the equipment out ready.
yep I've made a shelving unit and it took a few hours with all the wood cutting, and then another few hours painting, but it only took an afternoon really.