Also I want to warn you about this, since this is going to be something that drives you crazy if you are getting into breeding: DORMANT GENES.
The reason I'm warning you about this is because you are trying to cross two autoflowers, and thats going be an upredictable potluck of results. You have to understand that the deeper the lineage of the plant, the more difficult it is to predict when trying to cross it with other plants. Auto-flowers have a diverse lineage by default, and that easily doubles the complication of this, and make it a real pain in the ass if you are impatient. I'll give you an example:
Just because a Purple Kush may display the dominant gene that has a purple trait, it also has a dormant gene that wants something completely different. Perhaps this dormant gene prefers a white/orange coloration. Its the same thing in concern to humans eye color, hair color, etc. If you cross that PK with a plant that has white/orange genes ready to activate that otherwise dormant gene, you won't achieve any purple traits at all. Now you have a plant with dormant purple genes, and dominant orange. Dormant genes are a pain in the ass because they are generally unpredictable, and thats because Cannabis strains have been crossed and re-crossed so many times.
Your results during your first season will intimidate you...you'll see so much variety, on top of dormant genes making special appearances. It's very confusing and unstasfactory at F1 level. Just look at your plants, and go with your gut. Don't let it overwhelm you. By the time you get to f2 and f3, youll start getting more confidence picking that PERFECT plant you were planning to turn into a strain. I highly recommend buying the original lowryder, and crossing it with regular strains, then recrossing back to autoflower. You're dealing with alot less genetic accidents, and youre going to get much better results when trying to increase whatever trait you are going for, whether thats color or taste or yield.
Long story short: Get the genes for your flavor, yield, and potency from a regular plant. Get your short-life and stunted growth genes from the auto. Trying to get flavor or potency by crossing two auto's won't produce dramatic results, specifically the ones you are aiming at.