One of my mid-decade hobbies was buying Battletech 2nd and 3rd Edition boxes on ebay. They were like grab-surprise-bags for a while. Interestingly, you don´t find them as often as five years ago. Though I gained several things I never thought (MechCommander 2 + Manual, half used crayons etc.) I would, the important part were the plastic minis.
One box was terribly beat up and the rest of the plastic figs looked like that:

Although I could refit some Mechs with parts from other ebay-boxes, two Riflemen, a Shadowhawk a Warhammer and especially a Marauder were mostly junk.
I couldn´t throw them away, and planned to use them as "destroyed Mech" templates. But then I was pointed to Steel Heroes! With
Steel Heroes, I thought I might restore those beat up LosTech machines.

The Marauder also needed a stable footing, and prior glueings had not worked. So I went for drilling two holes in the leg and using part of an office clip as ersatz-skeleton. Drilling in plastic in that kind of plastic is actually easier than drilling lead, which surprised me, I thought it might splinter.

...and the result!

Now we applied ample amounts of spray-can base colour...

...and after it had dried, US-Army green was chosen as base for the Davion Camo.

Add some dry-brushing with a white/US Army green mixture and some highlights with whote and olive, and...

Voila!
The Rifleman variants are easy to come by, the Marauder might kust be perfect for a MAD-3L. I´m not sure I know of a matchng Warhammer variant. If you wonder where the SRM of the WHM went, look
here.