the kit looks very similar to the Airfix Mk.1a 1/24 which i have just finished.
the main issue i had was the decals. they were sooo thin. Nightmare to apply as they break as soon as you look at them & so thin they are actually semi-transparent when applied.
re: the engine, i can't see any reason other than supporting the exhausts & prop why you can't omit it, but the engine does look nice when installed. a reet pain to fit though. it's the bracing struts that caused me the most problems.
for me, the engine cowls don't stay in place without the glue which is unfortunate.
re: the undercarraige legs, mine are in the down position. if i raise them up, the cover on 1 wheel doesn't go flush with the wing underside, but i'm not bothered. not sure what you mean about shortening a leg, i didn't need to do anything.
in general:
a fair bit of filling to do.
a disappointing cockpit/seat/etc - detail-wise.
bad fitting front capony part (the fixed part), but milliput filled this nicely (great stuff!)
i stuck a custom-made crowbar on the cockpit door interior. looks great & adds a bit of much-needed detail.
unfortunately i also bought a Bf109 1/24 intending to build them as a pair, but i'm not prepared to spend the same time & effort on anything WW2 german.