Some stuff not to forget - Calculate your trace widths (based on heat/current requirements and copper weight - there are online calculators that do fine). - U

Some stuff not to forget - Calculate your trace widths (based on heat/current requirements and copper weight - there are online calculators that do fine). - USB data lines require controlled impedances, check your fab for a trace width calculator. - Don't forget via sizes, the default in your CAD tool is probably too small - Check your fab for their design rules instead of using rules of thumb - 4 layer boards are cheap enough for hobbyists today, don't be afraid of them