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AWESOME! Looks great buddy. Im totally stealing the magnet idea.
I have one of the 4-lane 3DBM finish lines...and it's great. It's lasted me years at this point. It's convenient, compact, and no fuss. BUT...it does have a few tiny little pain points, one of which didn't really rear its head until I got to a full 4-lanes.
First, the one that anyone with a 3DBM finish line knows, is it doesn't allow for flat/flush track. I know this is pretty picky, but since there are sensors in the bottom of the track, there's about a 1/2" rise. This is not a design flaw in the finish line, it's just the way it had to be as an accessory. It's one thing I never enjoyed but just accepted...
...until I added 2 more lanes of track. Before now, I always just ran 2 lanes in the middle, no real issues. However, when you fill it up with all 4 lanes, the track starts to have problems because the connectors on the finish line are too close together. Each lane starts to push up against each other and squish, which causes the outside lanes to be very uneven due to the 1/2" rise.
So my solution was to cut some of my track board, add an "lower support" and then make a tiny shelf on the other side, allowing me to drop the finish line. It feels hacky but it has helped the trash squishing tremendously. The lanes are still very tight but being able to keep the track flat going in (and out) of the finish lines makes me feel a lot better about the running results.