I finally finished the shock-mounted road case for my McIntosh MC250 - I suppose it could be better, but I'm pretty happy with how it came out.
Firstly, I found a 6 space rack case at a local used gear store. The case itself is composed of 1/2" plywood and contained in a rugged vinyl bag with a good amount of cushioning in it. However, the wooden box itself was held together only by 12 wood screws, and the only way to carry it was with a strap attached to the bag. I made it a priority to reinforce all the joints with a ton of quality steel angle brackets with 1/2" wood screws, I also drilled holes to mount quality steel handles to carry the thing.
Next I got some high-quality 3/4" ply wood.
I cut four 3" x 5" pieces to serve as the "feet" for the MC, then I removed the bottom chassis from the MC and figured out - using the 1/4" holes on the bottom of the chassis - where I was gonna attach each foot. Once I had all my holes measured and drilled, I painted the feet black and attached Tnuts (recessed) for the 1/4" bolts.
After everything was dry I attached the feet the the MC chassis via 1/4" bolts into the Tnuts, and 2 additional woodscrews in each foot for good measure.
With the MC on it's new feet, I slipped it into the reinforced box and measured where to drill the mounting holes - Centered, and fairly close to the front to show off the logo.
For the shock mounts, I used industrial foam discs that were intended to support heavy furniture on carpets (rated at 1000lbs) - two 1/2" discs for each MC foot, for a total of 1" shock mounting! I drilled 1/2" holes in the center of the foam discs.
Lastly, I used four 1/2" x 3" grade-8 bolts and nuts to mount the MC into the box atop the foam. I used neoprene washers on all contact surfaces for additional vibration dampening.
Worked like a charm, and the entire package is fairly manageable, even solo!
As I said, I'm pretty happy with the end result, and it seems that the MC is in there pretty securely. I use a 1m 1/4" to RCA cable from the Twin to the MC, and an 'elbow-jack' IEC cable - both are secured to the inside of the case - there's almost no moving parts and everything is plug-and-play! As a bonus, I'm placing my 2x12 cab atop the MC case for extra speaker height, and with a 2" lift at the front of the speaker cab, I get direct sound up at ear level!