Skate Ramp - Quarter Pipe

We bought 2 of these so as our 11 year old could have a quarter pipe in the back garden. They looked pretty good on the images and seemed fairly easy to assemble as the box said you only needed one spanner! So he and his brother went off to see their real dad and I was left with the assembly of these in anticipation for his return. I wish we'd never bothered! The assembly instructions are not clear (and I have assembled many an Ikea & MFI flat pack!) to a point that you're left blindly assembling hoping that poles are the right way up etc. Page 7 is where it gets really frustrating. Trying to get the ramp part assembled is a joke. There's hardly any space underneath the ramp to get spanners or any sort of tool for that matter capable of tightening the screws in the corners and just getting it to align is hard enough. Many an expletive was shouted as I got more and more frustrated with the assembly until it came to the end when I was left with a pole that was apparently for strengthening the sides. So i now have the spare pole fitted but with other parts that seem less necessary removed in order to enable this. Finally assembled this ramp does not seem as well made as it looked. The ramp has gaps (because I couldn't get in to tighten them enough) and there are small raised parts of the ramp where it just doesn't seem to fit together properly. AND I'VE STILL GOT ANOTHER ONE TO ASSEMBLE YET!!All in all, unless you're exceptionally well supplied with tools, exceptionally capable at following vague instructions, able to improvise where necessary - AND HAVE THE PATIENCE OF A SAINT - do not buy one of these unless you're willing to pay someone else to assemble it!