I'm about to finish my gravel build and my plan is to use a cheap android phone as an ad hoc bike computer. I have no idea if this will work, but if it does, I will have a full featured computer for a fraction of the cost.

Samsung Galaxy phones (generally) have ANT+ antennas, in addition to (of course) GPS and Bluetooth. I picked up a used Galaxy J7 for $50 which has the added bonus of removable batteries. I plan to mount this to a Garmin stem mount using an adhesive-backed adapter on the phone.

I tried this with an s5 and it works alright for short rides. My issue was that the battery only lasted an hour and a half to two hours at most if you have the screen on the whole time whilst using GPS and strava. The wahoo app worked better with all the sensors than strava did for me and if I didn't use GPS I'd get another hour out of the battery. This was after swapping in a new battery.

The other big issue I had with the s5 in particular was that the back cover was removable and when the road got bumpy the phone would separate from the cover (which was attached to the garmin mount) and going flying off . I tried fixing this by super gluing the back cover onto the phone but it just ripped apart a couple rides later.

So now I have a cycling computer, igpsport 620

I think I have the same flex in the rear triangle . I had my hand on the chainstay before when trying to check for any lateral movement and it wasn't bad at all but once I put my had on the saddle and tire it flexes something like 20mm very easily. I wonder if this is what caused the rubbing before  . I'm heading to the hardware store tomorrow to see if I can find a shim or washer that'll fit and tighten it up

Happy you guys like the frame, thanks for supporting, the full bicycle picture would be appreciated, thanks.

Do you need me to email it to you? Feel free to use one from this thread

I tried the line on the back of the derailleur as well and it doesn't matter if the line is above, below, or right at the teeth tips, the line isn't perpendicular and one side angles away, like the angle is wrong. I cut the chain at front and biggest rear plus 5 and a quick link. Something seems off and not finding what and the shifting isn't great and isn't spinning very smooth.

I've gone over Shimanos installation documents a bunch and keep double checking and expecting to find something off but it hasn't happened yet...

This is how mine lines up now. It was a bit off when the chain was short but sound like you sized yours correctly. My only other thoughts are limit screw not allowing the derailleur to line up with the big cog or maybe hanger is bent?

Are the linkage bolts torqued up enough?  If those bolts aren't loose, did the rear triangle feel all squirrelly?  Looks like it would have to move in a lot to make contact there.

The bolts aren't loose. Riding it down the street and back it felt fine. Not squirlly at all. Now im just even more confused. I'm not sure what else could have caused this

That spot on the left definitely looks like rubbing. I'm assuming the rear triangle is hitting it but the missing paint on the right there has nothing to rub against

Kydex custom downtube protector.  It still needs a little adjustment.  For reference this is from a 4"x12" piece of thermoform plastic.

that looks great. definitely next on my list!

Looks good!
How much of a pain was it to do the damper body conversion?

I feel like it's going to be a pain to do a full service but swapping the damper was actually pretty quick. Just reused the oil but did need new air can lube