Elevate Campervans needs a poster design

This is what a business in United Kingdom was looking for in their graphic design

I have an idea already that I'm trying to develop but I haven't got the expertise to do it! I've already sketched out something which is attached which is trying to capture what I'm looking for - see files elevate.png and elevate v2.png. The final design will be used on a poster which is 280cm x whatever height scales well with your design in LANDSCAPE format. The design should have elements of my design. I'd prefer line drawings over photographs.

I own a campervan company that converts plain vans into a van with a lifting roof (see www.elevatepoptoproofs.co.uk). I keep thinking of the ape to man classical drawing (attached) and was trying to show an evolution from a plain van to a camper van. In my design it's missing a slide, because after we put the roof on we can add windows, kitchens, van electrics, carpeting, solar so I'm not sure how to depict this or if I should avoid this.

I was considering having a silhouette of a man with a square wheel thinking … Read more