It can be done well, as long as you're careful to arrange them in a way where it all works together, rather than just throwing them all together randomly. I mean, this amazing fanart htat /u/gotrek_reaver shared yesterday is basically a full cast line-up and it looks amazing. I'm not campaigning for a full cast banner or anything though haha, just throwing ideas around.
As of now the only version of the manga you can pre order is the Japanese version.
You can order both the volume 1and 2 Japanese version on Amazon jp
When you buy this you get a physical copy not digital.
Link:
Volume 1: https://www.amazon.co.jp/gp/aw/d/4088820223/ref=ppx_yo_mob_b_track_package_o0_img?ie=UTF8&psc=1
Volume 2:
Remember this are the Japanese version
/u/Kaxew it's already at Spanish Amazon. Check it
you can preorder Samurai8 Vol.4 at amazon Jp now.(release March 4)
​
I hope that you order this too.