Extremely close to the original TROs of BT. Some of the parts such as weapon loadouts, armor type, electronics and such may vary depending on game play and extensive game testing. How ever, we want to remain as true to the original TROs as possible, and may even give some minor upgrades to the mech designs.
In terms of a cosmetic look, all art we've seen each Mech made varies from artist to artist so they can't look EXACTLY like the Fan Pro books concept. This flexibility allows our modelers to add their own special touch to the mech and perhaps improve on the design a bit. Still, a Madcat should and will look like it's supposed to with the missile pods and arms out the side with reverse kneed legs and tri toes.
As far as keeping it cannon this mod aims to bring new fans to the BT universe through exciting objective based gameplay using a mix arms aspect, if that means we stray a bit from the aims of the pen and paper universe then so be it, but i assure you it will be Btech and it will be far more exciting then a simple pen and paper simulation.