Here is a post I ran by Mr Merriman on some possible alternatives...read along and find out below what he said.
I have two subs coming. Looking at the Dave Merriman/Mike Caswell Snort D&E Sub-Driver conversion kit for one model positively.
I might do the second one with a Dave Welch kit if I can get one from BigDave.
I like two ideas that were incorporated by Dave Welch. No cutting and pumpjet openings in the keel. I should be able to make the Merriman one with the seam method. I may go without front dive planes. I would rather not cut any part of the model if I can help it. While a RCABS worked well for Steve Neills and I do have a RCABS pump from Art Broder, I am thinking I might try a bladderbag and two way water pump if I can get a BigDave Pumpjet.
This is Steve Neills RCABS version of BigDaves.
Pics from Steves build, No working front dive planes or sail planes.
#1 No cutting...only use existing seams with a clever magnetic missle hatch.
#2 550 PumpJet with vents in the keel
Steve Neills SeaView
I have been thinking of adding depth control from the nicelle rear fins like this.
Well it turns out that Mr Merrimans Seaview has no nose dive issues. So to make it work properly I will need to have the front manta fins functional and also most of my water intake above the Nicelles, not on the keel portion, as this contributes to nose pitch with backward motion. So I will make them as Mr Merriman suggests. However he did conceed that with internal fixed vanes in the nicelles that you can do without the cutting of the manta fins and front bow planes. I do plan on trying to not glue anything but the windows. The way Steve Neills approached his build was genius. I have ordered 100 1/4 x 1/16 neodymium discs.
I also got an email from Dave Welch and No pumpjets from the orignal setups pictured above will be sold. Dave Welch is working on a replacement powerplant. His WTC for the SeaView are coming this spring.
I am looking forward to my Caswell/Merriman Snort SeaView as my first project this year and sailing my Robbe SeaWolf Dynamic Diver with my SeaView Static Diver.
Here is an excellent thread by Stingfly