@nau You make one. With the solutions you mentioned.

Visual:10/10.
Combat:10/10.
Production 10/10.

Its cute af so 100/10

Visual:6/10.
Combat:3/10.
Production 2/10.

While this seems good in looks, it is not as great in combat.
The few issues with this regarding production is that it uses multiple subgrids. The legs help any type of land explosive device (aka a landmine or IED) it is not really worth the complications regarding producing it. As you will most likely never drop it on a landmine.

Secondly, combat issues. Heavy block armor is decent, not an issue at all. Though the heavy blocks add onto weight over time if using cheaper/weaker dropship.
The heavy blocks are also kinda useless. Useless in this context is what I mean. Once the cannon turret is destroyed there is no use for the heavy blocks. The heavy blocks also do not protect the turret itself making it so the turret will be destroyed far before the internals.

To add to that, it is only 1 turret that being an assaultcannon. While subgrids are annoying to produce in numbers, this creation would have been worth the time to do so. If you replace the assaultcannon with a custom turret with many gatling guns or whatever it would deal enough damage and because it is a custom turret it would be more armored.

Depending on what you like, quality or quantity. I personally do not find this as either. While good looking it is kind-of useless.