I built one straight line similar five or so years ago, now every manufacturer has them. Didn't get off the short bus soon enought
I found out with messing around 28"+ rod will work better than a shorter one , the line seems to move freely through the guides.
I had a broken B N M sharpshooter , cleaned the handle up, epoxy the rod into the handle , the shorted guide distances works great.
Used an older model western style fly reel, has alonger seat base. Love using it on deeper water.