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Doesn't look like you can do much. looks like 12inches of headroom and not much roof pitch.

Put some 3/8" round stock into the track and beat it with a hammer till it takes shape.

I come a from a commercial door background and don't do much residential work but a side mounted operator on standard lift track does have problems throwing cables off the drum. I imagine the 3800 has a "soft start" to help prevent it. The installer would probaly over tension the springs to help...

Yeah, for anybody attempting this in the future. Do not use tools (screwdrivers, extentions) You want to use a rod that will bend and not snap in case of failure. Also put your body to side of the spring when adding tension. So if something breaks it shoots across the room and not into your body.

That magnetic sensor on the floor is a security alarm contact. has nothing to do with the door.

The door and the motor are not sync'd. The motor thinks the door is still in the open position and partial tension may have been released. There is sequence of steps that have to be done to reset the door or you may break the spring or not have the door properly drop in the event of a fire...

Here is an install manual. There are pics of the pulley system. http://liftmaster.com/CatalogResourcesV3/en-us/shared/files/tucmanuals/0134925.pdf\

This how a gate opener is designed. 2 idle pulleys on the sides of the drive sprocket. If you bought an opener designed for a gate then it should be easy. If you bought an opener for a commercial door it might work with fabrication. If you have a residential operator no way will it stand up to...