It is true, you would absolutely see the cannons and the wings in the front facing cockpit views.
This is the 3D model of the snowspeeder ripped from Battlefront 2, that has photo scanned models from the movies, so it is accurate.
https://i.imgur.com/LoIpkpy.png
The life size versions used on set of course had the cannons removed, but also the wings seem to be a lot more steep as well, so it may simply be the case that they’re just out of view below the edge of the cockpit.