RE: fitting batteries
This isn't myplane - rather a shot I found elsewhere on RCU, but it shows the cowling / pipe tunnel arrangement well. There's a small chin cowl which comes off, and then a fully enclosed pipe tunnel, open at the front and back for cooling air etc. The batteries will half be completely within the tunnel and half sticking forward of the opening (ie into the space under the chin cowl). Supporting the front half of the batteries will be no problem as they will stick forward but the rear half will be fully enclosed and inaccessible.
James