the motor is super tight fit in the case, the wire hole has been siliconed, front motor is alreayd encased in plastic by manufacturer, only open to problem part is sprocket (pinion) and i have liquid taped it. For the fleece i've made a hexagonal hole in one of the rolls in order to user a electric screwdriver to roll it on the spool.
The spool is a redsea reefmat 500 rolls that i've cut to size with a kitchen knife and a 3d printed template and then rolled with the electric screwdriver. It takes few second.
Isn't the best one but is surely the cheapest one, even if i have to replace a motor every few months, it's like 2/4€ to do it.