DaveW- Could you explain some of these points further for the Advantage/Diasdvantage way the OP wanted
You can locate the tank on the CG...<snip>
Better fuel draw....<snip>
You don't have to add lead to the nose of many scale planes.
With a stock carb on a weedie with GGL (tuned to meter rich enough), what is with the Fuel Draw - which is also the Tank Placement line, I imagine.
But reconsiling the need to move the tank, with having to add nose weight..... move componants like tail servos & TANK to fix CG. Fly lighter. Lead is for Boat keels, not Plane cowls
Cutarug- the oil is plenty in the 10nitro-10oil glow fuel.... just add 2 parts Gasoline to 1 part
10/10 glow, not the standard 10%nitro with 18%oil glow fuel most .40engines use