For an electric SPAD, you can "Swiss cheese" the fuse to save some weight by cutting several large holes in the PVC downspout (see attached photo of mine). If you're worried about drag, you can use packing tape or other adhesive film/covering/tape to seal the holes. I just used a hole saw drill bit to do mine, that's probably the quickest/easiest.

The photo below is of a fuse that preceded my nitro-powered Derelict-based SPAD in my previous post. I tried using a brushed motor/gearbox and NiMH battery power system, and it had horrible power/weight ratio. If you use a brushless/LiPo power system, you should be fine. After my electric's failure to perform, I used the wing and tail on a new solid fuse and built the nitro SPAD that I showed in my previous post.