EXCAL II coil swap

[atexaspete]

Just received my new (to me) EXCAL II with 10" coil. My preference would have been the 8" coil. Is there any way to change coils or modify the EXCAL to accept other coils? If so, which coil would be recommended in the 8" range (I still think I'd like to stay with a DD).
Thanks in advance for any info,
Mike

 

[OneEyedBandito]

Is that setup fully waterproof ?