Wanted to do this project last year but never got around to it. Followed the parts list from a build on youtube and did some tweaks to the guys original design so I thought I'd share. Still not sure If I want to do a second battery or not but the option is there by using the small ram mount for the 7" screen, there is plenty of room for mulitple batteries.
I started by pulling the foam bottom piece out of the clam bag and drawing a template onto my plywood. I cut the piece (approx 11.5"w and 8.5"h) sanded the edges to round them just like the piece of foam. Wood will sit on top of the foam and I will be mounting ram mount ball and the pvc piece to hold the transducer (still not sure what size pvc as I haven't recieved the transducer yet) I had some old campaign signs that I am going to measure and cut for the insides of the bag (to help with rigidity) which I'll staple to the wood at the bottom and gorilla tape the sides to kind of "box in" the unit. I've had different versions of these soft sided bags before and never liked the extra space/material that made it awkward to carry or store in the sled. Once I decide on the final "floorplan" I'll add an open eye bolt at the front to run the transducer cord through so its nice and neat on the ice and always at the ready. Should be finished as soon as the parts come in, any questions or suggestions please feel free to post.
my parts list (will add as the project finishes)
12v battery (had a couple sitting around from other flashers)
clam 9749 flasher/gear bag
eagle pti-wbl portable transducer
Lowrance Power Cable for HDS PC-30-RS422
small piece of plywood
something to seal the wood (i just spraypainted mine)