One thing that helps me is make sure everything fits befor you glue it. You would really be surprised what can throw a model off. I also take my time and let glue have time to dry. I let things sit sometimes hours to overnight. Build the suspension on the chassis then let it sit and work on the engine. Never force anything..
I like the pyramid cut. Fits your theme and is easily spotted with your theme. I can understand how you want to tie it all together, keep it going man..