This is my take on the E3D Buggy contest. 

The roof is now a planter and in one of the pillars you can hide a piece of cloth or a cotton string for self watering purposes. If you fill the tank (trunk) with water the capillary forces will make the water rise up the pole through the cloth and wet your soil. 

The models in the picture are scaled as follow: 

Blue 100%, Black 130% and Grey 150%. 

It actually works great, you can test it beforehand by putting a piece of paper towel on the roof and see how it slowly soaks itself.

Edit: Although i really dig the bonsai-esque falt pot style I figured someone might wants to put in some pretty flowers. So I added different variations in regards of the size of the pot. You will now also find a 15mm, 25mm and 35mm high pot size at the model files. 

Print instructions:

Model parts are already in the proper orientation. Should print just fine with default print settings. Feel free to use the .3mf Prusaslicer file (scaled to 150%). There I did some tweaking with some settings to make it even prettier (bridging angle, fuzzy skin on the top, etc.) - as seen with the grey one. The only thing you need at home is a piece of cloth or cotton string.

The petrol can is actually optional. But printed with 0% infill and 0 bottom layers you can use it to refill the tank and it fits nicely into the trunk! ;) 

Hope you like and enjoy it. I am really excited to see what you put in there and I would love to see even bigger scales in action!