Bruder Cat 320 RC conversion parts

These are some of the parts I designed while converting a Bruder Cat excavator in to a powered RC Model. Much more info about the build can be found here: http://www.rctruckandconstruction.com/showthread.php?s=69a64ad97899978b72a5034a1ab10f6e&t=12300

I got the excavator driving and turning but I never completed the conversion and sold it partially done to another modeler who plans to finish it. I will not be able to provide any additional support or advise as it is a project that I have ab