Small Footprint Vertical Bicycle Stand

Short but sweet instructable this.

I wanted to put my bike out of the way of my housemates, somewhere I could admire it. At the same time living in a rented house means I couldn't screw or nail into the walls or floor.
I didn't want horizontal legs for people to trip over, so designed my own stand with a very small footprint.
This stand securely holds the bike off the ground, with space for another below if you wished. It can be adjusted to fit different ceilings if you move house.
This is more of a design than an instructable, as I wasn't able to take photos as I went along. It's fairly obvious, as you can see from the completed article (Fig. 1.)

You will need tools and consumables.
Consumables
~4m of 2" x 2" wood bars rods. Wood is easier to obtain than Ikea parts around here, and cheap from the local wood recycling centre.
2 5" x 5" flat bits of wood
Quite a few long wood screws
2 bolts and 2 nuts to fit
Sandpaper

Tools
Saw
Drill
Drill bit sized to make pilot holes for the screws
A drill bit of slightly smaller diameter than the nuts
Measuring tape
Wood square
Pencil
Level

Instructions
Chop wood to fit (measure and measure first with tape, square and pencil)
Drill pilot holes
Screw together

Drill holes in the bottom of the large vertical uprights, and force the nuts into them. The bolts screw in to the captive nuts, and can be unscrewed a little into shallow disks in the bottom plate to force the top plate against the ceiling. The force should be enough to stop the assembly falling over. If you have fragile ceilings you may wish to put this force against a joist rather than breaking through into the room upstairs.
Sandpaper all edges to make sure you don't get splinters
Use the Level to ensure the uprights really are vertical. If not it is more likely to fall down.
Test thoroughly for all eventualities before putting your expensive bicycle on!

Discussion
I wasn't happy with the safety of the assembly shown in the photo, so after taking the photo I increased the size of the top plate. Screwed on tightly to the top, this in conjunction with the force of the nuts and bolts below is the bit that stops the assembly falling over.
The stand lasted the rest of the year I was in the house. After that I didn't need it, so chopped it up to make a ramp for an arthritic cat (Fig. 2.). She likes to sleep above the stove where it's warm. No, we don't prepare any food on those surfaces!
Good luck!