If possible, try to "widen" (or something similar) the bottom of your firewall. Drill two vertical holes in it. Make your landing gear from piano wire and in an "H" form with the bottom legs of the "H" much longer than the top legs (you'll need more than one piece of piano wire as well as some copper wire wrapping and soldering will be required). Bend the bottom legs of the "H" outwards - this is where the wheels will be attaching. The last 1/2 in. or so must be horizontally bent to act as wheel axles.

The top two vertical posts of the "H" slot into the drilled holes of the widened firewall. It is very important for this to be a loose fit. The whole idea is that the "H" with the wheels will drop away from the aircraft the moment it gets airborne. Be sure to use hardwood to drill the two holes into. You don't necessarily need to use the firewall - just mount the landing gear where it's suppose to go. The firewall just worked well for me on my 049 C/L aircraft.

Good luck
Louis