- As Ton suggested, I would start with a Blend between two dashed lines (the second line is a duplicate of the first).
- With the Blend selected, go to Object > Flatten Transparency and make sure "Convert All Strokes to Outlines" is checked and click OK. This will make the Dashed Strokes into Filled Rectangles (and will will solve the "slanted dash" problem).
- Then take a look a how to use Perspective Grid. Here's a video: http://www.jeffwitchel.net/2014/05/now-perspective-grid-is-amazing/
See screenshot below for results.
Hope this helps!
