I ordered a desktop cradle of my former tablet the Tab 10.1 on aliexpress. And an USB cable from Asus.
Opened the box, pulled out the Samsung connector. And removed the plastic housing of the Asus charger connector.
With a little cutting on the old hole of the case. I put in the Asus connector. Glued it with hot glue. Drilled a hole in the back of the case to leave the cable in tact.
And Voila a nice solid desktopcradle. For around $18.
Sorry for the bad pics.....but you have a vision on how it looks..
Good luck on making one of your own.
Here a link of my ordered cradle