Leviathan Ballistus Conversion

Hi guys! I am trying to convert a Leviathan dreadnought (which i love) intorno a Ballistus dreadnought (I am not a great fan of the model). I took ideas from other posts around here, and here are my two options. The lascannon arm is decided i think, what leaves me uncertain is where to put the missiles: one of the arms like the regular model, or top?

Here are the two versions, all is still to be glued...and I used an old IW model to figure out the top missile option (but it will have lascannons instead of the bombard)

I d l9ve to hear opinions both coolness and playability wise...

(The base is legally 90mm)