Only comment is if you are using solid leadouts you need the larger (short) eyelets to allow the solids to flex and not stick. I have used the nylon block slider with flexible cable works great. I have also done the plywood strip with the multi holes and eyelets that works and is a little lighter then the nylon block slider. The plywood with multi holes is simple to make and gives you roughly -+3/32" position control which for me is well within what I can notice at the handle.
One tip I would suggest that you consider, have the leadout overhang long enough for one clip off and reset the ends. This allows changing the slider block/eyelets out at least once if you are a heavy flier without needing to dig into the bellcrank to change the whole leadout.
Best, DennisT