Although the pictured rack did survive the garage door compression test, it was not optimum for freeway speeds and curvy roads, ie Skyline Drive and MD backroads.
The current and best, solid iteration is with a Reynolds 240 rack, and a angle iron welded "U" to support the mid section of the bike tray. It works a treat, and eliminated the vibration issue at speed. I do add straps to the bars, and attach those to the pillian mount triangle open space ... once tightened down, it's only noticeable at some stoplights as you slow and the rear heavy and high weight may cause the front wheel to shimmy a bit. Irritating, but not scary in the least.
Best part is, the brick is 1000% safer on the streets, as cars notice the flying bike and many slow down to take cell phone pics. Have gotten lot's of "thumbs up" from caged beasts.
Good luck with your build, I used a standard tray, strap for rear wheel, fork mount QR, and front wheel clamps to a tuning fork that's bolted to the rack and can swivel to put pressure on the pedals to keep everything stable. Took the MTB ('Dale SV2000 carbon swingarm) to the Rosebud area, and didn't have any problems on the Beartooth Hwy curves ... and the 'Dale is a Sumo by today's weight standards!
Cheers!
