Unlocked BL, rooted TF300T, Hydro 4.4A -> JB?

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http://forum.xda-developers.com – So this is the scenario, my TF300T (WW v30) is unlocked, rooted, TWRP and running ICS 4.0.3 in the shape of Hydro 4.4A. Questions: a) Can it be updated (manually of course) to US JB4.1? b) What are steps to do it? c) Is root and/or TWRP lost in the process? The silence around the (only) custom ROM for TF300 is deafening, i am willing to go stock JB and don't wait for updated Hydro....i only installed it because i was tired of browser lag and needed to use browser2ram...which lag i understand now is fixed in JB. Thanks! (HowTos)