I retired my Limbo in September. By December it was out of early retirement! It is one of my favorite models.

It's got an OS 32sx with weston throttle pipe, standard servos a 1400 4 cell that sits below a 138 rx between the tank and the servo tray.
There is no extra weight anywhere. The CG comes out at exactly 110mm from LE. I have tried it further back but the model does not fly as well.
I rarely use flapperons on this model but it will still harrier quite easily. Torque rolls are a little too quick and the attitude has to be absolutely perfect due to the aerofoil ( It has a habit of stopping half way round if it starts to fall out)l. I can prop hang it all day long and fly it around in a prop hang (Thanks to realflight G2!). Spins are pretty dull and not particularly flat.

I run just a 10x4 APC even with the throttle pipe. A setup which I highly recommend. The throttle response all way through the range is terrific. It will climb from a hover like a bullet.

All that said it does look so much like a patch work quilt.
Lessons learned
1. Don't prop hang at 5ft with an empty tank. (Bulkhead out and fus side split)
2. Don't fly too far too low with a hang over. (Middlle section of leading edge gone!)
3. Don't prop hang at 4ft with an empty tank - a monkey would have learned not to after the first time! (Bulkhead refitted and rewelded undercarriage)
4. Don't show off by dipping the tail in a puddle. (Damaged ego and wet feet)
5. Don't drag the tail in high alpha when your the wrong way up (fin snapped off)
6. Don't do any of the above when committee members are present!

I have recently fitted a carbon bost in fron of the fin to stiffen it up a little. Makes no differnce to flying it but it should stop the fin snapping again.