[Antennas] just getting started, G5RV questions

[KC2NWG]

Hello all,

Brand spakin new to ham radio. Passed the general written and waiting for my code exam.  I am trying to plan my very first antenna for hf.  I gotta tell you, seems trying to figure out where to hang this is more difficult than the construction of it!  I am thinking of using a wa2nan "true talk" G5RV (anyone have one of these? 'Cause I have some questions on that too) either the 204' or 102' versions depending on how I can try to get into trees etc.  So here's my question...

My house has two chimneys, one on the left and one on the right. The third floor of the house is a shed dormer in the rear only and is used as a playroom. 

I was *thinking* about using the center of the roof (above the dormer) as the center of the dipole, then feeding either side past the chimneys (probably going through some kind of support) and then onto trees on either side.  Doing this would place the center of the dipole at about 30-35 feet above ground, but either on top of, or 1+ foot above the shed dormer (house is wood construction).  The radials will run either on top or 1 foot above the house for about 25+ each side (50 feet total) before being in open air.  This scenario would be for the 204' version.  I should mention I have a murch 2000B 160-10 tuner and I plan to run 100W

What do you think?
Eugene


Is this a major no-no? Should I only consider hanging arrangements