Like the others I understand you want to make a diorama but not sure what "all on one base" refers to...?
As to samurai dwarves, my instincts say emphatically "no!".
Grimbold Blackhammer
In WHFB you would have 25 models in a umit say set on bases 5 x 5 in a movement tray.
In KOW all the figure in a unit go one base ( so could all be glued in the movement tray or one base the size of the above
Because you do not have individual casualty removal you could put 20 figs out of the 25 on the base and fill the space with a diorama say a wagon or small shrine etc )
They are a re pretty good size..... a friend has some as dark elves, but I already bought the mantic ones........ got fantastic deals at their annual gt.
Westwind are very chunky figures. i have around 100 varans guard and some xbowmen that i bought for a failed dwarf project.