So you just glue the spacer and battery mount together? Dat would eliminate screws protruding into the battery tray..
I use really short flathead screws, a few into bottom of spacer and a few in top through the battery tray, countersunk so the heads are smooth with the inside of the battery tray. Then I throw little thin padding in there to cover them up.
I had a bunch of xray screws left over from the nitro parts of the kit that weren't installed and I used those to mount the spacer and tray. Try to use the pre-drilled and coutnersunk holes already in the bottom frame of the buggy where the engine and the gas tanke would've been mounted - much cleaning this way.
“Everyone has a right to be stupid; some people just abuse the privilege.”