.....doesn't look as though you have been exactly bowled over by the crowd rushing in to provide advice.
I'm answering because I've just bought one. Unstarted, second hand dating from the mid nineties so the electronics were a little dated. As a start I decided not to go with the dry hull and hatch arrangement and replace it with a wtc.
Then I got lucky and found a wtc for an Engel type 7 for sale, being parted out with components offered seperately (sub swap is great...). Bought it all as a semi complete thing. It will fit. I've now a lifetime supply of Engel piston tanks....
The hull looks to be a lot of work.....all those holes to cut. Frankly I don't think the shape is that accurate....it's too full in the stern to my eye, the conning tower I'll replace with another I have to hand from another project. It needs a good deck....I intend to produce a laser cut item for this. If there's any interest then some extras could be run off from the same file.
I'd be very interested in any comments you may have with this one....
“The difference between genius and stupidity is that genius has its limits.” ~ Albert Einstein.