Ive been messing around with adding the Japanese buildings into British extended. its not perfect. visually it looks pretty good but the passenger generation values and class values need to be modified. there's a lot of potential here though. there's a ton of content for Japanese simutrans and i hate to say it there's a wider variety and more visual appeal than the graphics of british 128 (sorry but drab brick houses and towers are not my definition of eye candy)
check out my album and let me know if you have any questions.
https://imgur.com/a/1gWIt
All progress towards a Japanese pakset is a splendid thing - however, I am afraid that I cannot see the pictures as I am for some reason unable to view things uploaded to Imagur. Are you able to upload them elsewhere? I should be most interested to see these.