Ok, details...
The mods I made were MINOR mods, and I mentioned them earlier.
Instead of the paper motor mounts that come with the Big Daddy, I just went and bought some Basswood at a local hobby shop, and used them. Now, on the inside, I used a small eye hook attached with nuts and a washer to the top motor mount. Then, using some 3/8" braided elastic I bought from WalMart, about 4 feet, but 6 would have been better, I tied the nose cone to one end, and the other end fastened to my eye hook. Then, I spent some big money, $14.00, on a Public Missiles, (I think, there are two brands out there) Positive Motor Retention, PMR, system. This is basically a motor holder, that is much more secure than the Estes, or Aerotech "Hook". You actually put two screw recievers in your bottom centering ring, then this thing has two screws you use to fasten the circular holder to the frame of the actual motor. I already had the system, as I used it in my Minnie-Mag for certifying, so there wasn't any money spent on it for the Big Daddy. Oh, did I mention that I made the actual 24MM motor tube from an index card? Real easy to do, and works very well. You take an index card, using Elmer's white glue, roll it around any 24MM motor, a D, or your brand new RMS. Then, remove the motor, after the glue has started to set, don't want to make a mess of a perfectly good motor do we? Let it dry, and BOOM! Instant motor mount tube. Or you could just go buy one, and cut it long. Anyway, I then use the stock forward motor stop, usually a little green deal, make sure it's far enough forward to accept your LONGEST motor, and there ya go. Saved yourself a total of probably $1.00. (every little bit counts, dont it?)
Ok, so, there ya have it, very MINOR and SIMPLE modifications. Of course I used 5 minute epoxy EVERYWHERE, (except the motor tube), and before putting the bottom centering ring, run a bead of internal fin filets, can never get those fins too strong. : )
Now, if you want some finishing tips, you can either troll RMR, like I did, or I'd be happy to throw some of them at ya too!