Here's my take on Weird WWI, definitely to include huge landship dreadnoughts on the battlefields as well as the most rudimentary of walking armored vehicles, clankers to borrow the term from the novel, Leviathan.
Also a nice sprinkling of 'super-science' weapons such as directed arc-lightning cannons, vortex producing artillery shells (tornado in a can) and of course, the skies filled with all sorts of winged-wingless wonders.
In said setting, fearing an assault by flying monkeys would not be so far from the truth !