Id contact Panama Passage. They are a Forum sponsor I believe. They can take care of the logistic for shipping and provide a safe place to stay in Panama.
http://www.panamapassage.com/
As for the other questions regarding the vehicle in country I cannot help.
But the PP folks maybe of assistance with that as well. I hope that helps a little.
Good Luck safe travels.
2006 Toyota Tacoma Ute.
1994 LandRover D1
2008 KTM 990 ADV-sold
1972 Toyota LC FJ-40-sold
1992 SWB RR Classic-sold
2006 BMW GS1200-sold