The easiest/best way to look at Battletech LAMs is to not look at them as trying to be Macross knock-offs. That just isn't going to easily work anymore with the more modern design rules now in place. Although if you honestly think you can pull it off, I salute you and would gladly buy you a cold beverage of your choice, you glorious madlad you (although I suggest asking Plog, Shimmering Sword, or Eriance, to draw the final version).
What you really want to be doing, is pulling ideas from Zeta Gundam and later, with any units that have 'waverider' modes.
Macross = design the jet first, then design a robot/mech/mecha that can fit into that shape and transform. Aerodynamics over other alt-forms.
Gundam = design the robot/mech/mecha first, then Rubic's Cube the design in a way that at least passably has Aerodynamics. Aka the 'strap a big enough rocket to a pig, it'll fly' method.
Since in Battletech, 'Mech "mode" is the primary mode above all else, you need to think of it from that perspective. Also, if you do think of it from that perspective, it also completely explains just WHY the original LAMs were utter garbage and/or took freaking forever to get the bugs out - they had worse aerodynamics than an Urbie with a fusion rocket shoved up...there. At least an Urbie has a curved head/torso for some (barely reasonable) aerodynamics. It wasn't until they 'redesigned' the four working designs into the Unseen versions, that the aerodynamic issues truly got sorted out. Prior to that, it was brute forcing it via using a fusion torch and paying lip service to airfoil shapes. To get back on topic, a LAM *must* be a 'Mech 1st, aerospace fighter 2nd.