Hey, @Justin ONeill! Have you been able to check out Marshall's 1994 perspective lectures? He makes them available at his website for U$12,00: https://marshallart.com/SHOP/all-products/all-videos/1994-perspective-drawing-series/ It's a modest production, but the content is gold - I know I learned a lot when I studied these lessons a few years ago. If you feel like digging into basic-to-intermediate perspective concepts and techniques, I'd highly recommend it - at least for now, while his course here at Proko isn't out yet. :)

It's still in the works. I can't give an ETA myself but I know he's been hard at work with it and believe he finished up a student feedback round not too long ago.