Converting Manga diagonal panels to webtoons vertical format

I draw all my panels in print resolution book format, cuz I dunno... I might wanna print it out one day, or list it on amazon as a graphic novel or somethin.

I'm well aware that at the end I would have to convert them to webtoon vertical format, cos I hate reading a cramped up book style panels on my mobile, it just doesn't bode well with my eyeballs...
At first I thought this should be an easy 1 hour job for each chapter, little did I know, it took like friggin' 4-5 hours to convert my first chapter!!!! WTF!!! ARRGGHH!!

There's this super awesome tutorial by Jason Brubaker on youtube, on how to convert your panels to webtoons vertical format.
I learn all my webtoons panelings conversion from eyeballing his amazingly gorgeous Sitrah on webtoons. That beautiful series make use of the infinite canvas beautifully to support the storytelling. One particular aspect that catch my eyes was the use of diagonal paneling which I applied to the opening chapter of my comic.

So this is the book layout version of page 3 of my opening prologue.

I use diagonal paneling that sometimes seen in manga

If I just slapped that entire one page in webtoon as is, it's gonna look super cramped and small when seen in mobile phone.
I also want the reading experience of what happen in the story to have more impact by showing one panel at a time.
Just putting one long box panel on top of one another just feel too boring for me, so I played with the diagonal-ness of it to make it more interesting as a composition. I got this idea from reading Sitrah chapter 59 on my mobile phone.

Keeping this diagonal-ness in mind, I made sure that when I colored each of these panels, they doesn't get cropped exactly at the panel line, just in case I needed more than I need.

Here's how it looks underneath the paneling mask:

I thought of Sitrah chapter 59 in mind when painting these, so I painted beyond the frames

And this is the final webtoons version, after a few clone stamping added to patch in a few holes here in there:

The extra work of converting each pages to webtoon is a giant pain in the ass at first, but when I was done with it, I'm happy with how it turns out. I don't think I would've felt the same with just slapping those pages as is.

Composition and feel-wise satisfy me better than if I just slap that entire page straight into webtoons.