Don't worry about your mecha artwork, to me it gives an idea how the mecha you imagine would look like.
Well here's my mech design.
First some background story.
TECHNOIDS
Storyline
4444 ad, human civilizations have rapidly grown advanced and thus begins the race towards space. With the advancement of technology humans were able to colonize planets in the solar system. Due to great advancement of technologies they were visited by guests that they have been waiting for centuries, the aliens. Different races of aliens visited the humans and made contact with them. The humans are no longer considered as an outsider anymore, they have been accepted into the circle. For years they shared knowledge with the aliens but suddenly the aliens stopped contacting with the human races and disappeared. The technology left by the aliens will later be used to manufacture mech units and advanced spaceships.
4900 ad, the humans now spread across the solar system made a council under a treaty they called the United Galaxy Federations, the Galactic Command is born and Earth is chosen as the leader of the Union. However the decision of Earth as the leader of the union was not well received by the Jupiter, Uranus and Pluto federation. In 4905 Jupiter, Uranus and Pluto quit the Galactic Command as a sign of protest and formed the Solar Uniformed Union(SUN). GC sees this as a threat took defensive stance by positioning their warships near SUN borders. The warships are joined by space fighter jets and the newly developed weapon of the humans in the solar system, the Technoids. The Technoids are machines that actually perform labor tasks but later were produced as military unit due to the maneuverability and the ability to fight on any terrain and weather.
Divisions/Units
Mini Fortress Rumbirue
Mega Tank Mecia
Mechanical Guardians
Here's my mecha design for Rumbirue. One is a really old drawing and the other seems kinda sketchy and I'm too lazy to finish it...
Rumbirue codenamed Mini Fortress is a prototype mecha that could carry tanks and fighter jets units. A successful prototype would lead into the building of the gigantic mecha unit, the Mega Fortress which would be able to carry hundreds of vehicles and fighter jets.