For the "spikes" I have two options available. They are pictured here:

IMG_20120101_201535 by imperialarmory, on Flickr

IMG_20120101_201806 by imperialarmory, on Flickr

IMG_20120101_201606 by imperialarmory, on Flickr
OR...

IMG_20120104_022219 by imperialarmory, on Flickr

IMG_20120104_022225 by imperialarmory, on Flickr
Please ignore the emitter tip in the picture above. I am planning on going with something a little more accurate.
MOD: The photos on your garrison page are restricted