Barbell Collar new design for different type of useBlind

I have provided a basic design of a piece of furniture that I would like to provide to a CNC fabricator to be cut out for assembly. I need my Powerpoint sketches turned into a 3D design and the component pieces layed out for cutting on the two pieces of plywood to be used. This design will be sent to the CNC fabricator for cutting.

We have 4 items that we can knock up in sketch up in about an hour. However, sketch up doesn't handle recesses or chamfer very well. We are looking for these 4 items (2 are incredibly simple) to be made print ready for us to print, test and revise.

I need a simple revision of this design. It was created in SolidWorks but I guess it can be revised in any 3D CAD software as long as the file is saved .STEP. A mold will be made from this in a CNC Milling Machine but as it is now can't be made because there is a space between the snakes body and the top of the skull. The body of the snake has to move down. See attachment 2 for exact position. You can download the original STEP file to work on. It is the first attachment but might take a few minutes as it is a large file.

I have made a prototype of the attached drawings but the gears didn't have enough torque and the wheels slipped on wet floors. I made the following changes to the prototype I built: 1. I duplicated the front Wheels (Part #23) to replace the back wheels (Part #3) 2. I duplicated the Roller GearWheel V2 (Part#9) to make the back wheels work the same as the front wheels 3. I duplicated the Reducing Gear (Part #24) to connect the new back wheels to the gear mechanisms The gear torque works great now but the 4 wheels still don't have enough surface contact to stop slipping on the wet floor. I believe all 4 wheels need to be wider to have more surface contact to stop them from slipping (hydroplaning). Challenge: I need the wheels to (#23) to be as wide as possible and change as LITTLE as possible to the rest of the parts and avoid extra costs. I am pretty sure I will need to re-print the Reducing Gear (#24) to make the wider wheels work with them. If I have to adjust the holes on the Plate (#7), I would like to do it with a drill instead of reprinting them. I am hoping there will not be any changes needed to Roller GearWheel V2 (#9)

CAD File Markups See attached 7 Electrical CAD Files, also see attached the construction handwritten mark-ups. CAD Files to be revised to new version with the mark-ups. Return copy of CAD File and PDF of the 7 files. Need completed this weekend, thanks!