Gentlemen,
I realize an oil valve might be more failure points, but if it's mounted correctly, . .I don't think it'd be too great a concern. I plan on mounting the valve in the hell hole. That way, if it gets too cold in the summer, the GIB could still access the valve and turn on the heat.
Even though well insulated and with no air movement, my guess is that it might still get uncomfortably warm for the GIB during the summer. Remember the clear canopy with the sun beating on you and then the 200 degree oil in the cooler.
If you'd like pics of my set - up, send me an email.
Glennbob.
P.S. I don't have the oil lines or valve set up yet.