Well I'm from Cork but I was suggested Trihy sawmills (
http://www.trihysheds.ie/) outside dungarven so not that far I guess. They deliver for 6Euro

Now they will rough cut ends off planks to suit, and I mean rough but I tidyied up 12ft of the wood in about 2minutes with an electric planer. Took off 2mm on all sides. My boat is 18ft and I got 60ft of Larch (5 strips) and I picked the best lengths (least knots which are a balls during bending!
I then gave a 45degree plane to take off the corners and sanded smooth. Total prep for wood was about 45 minutes.
I then used trailer harness's and a few clamps to bend the wood in place and a added a nice miter joint at 45degrees to join any wood (a tip here is to have 3 18+Volt cordless drills set up - one with drill bit to guide hole through wood and larch, one with counter sunk and one with screw bit). One of my strips cracked at a knot at around 10.5ft (on the final screw no less) and I just cut that back 6 inches and continued as normal.
Bending and screwing took about 1 hour, but I tend to go a bit slower and make sure everything is perfect

While I was at the sawmills I got slightly wider and thinner Larch and made nice handrails out of that also… same price bout 2/3 Euro for 12ft so I got 48ft

again, it needs a plane to tidy it up and any cheap electric planer will do. I borrowed my dads he got in Bandq for 17Euro.
If you can get remotes for 40 new take em. The yamaha remotes I need cost about 300Euro - hence why I may try to build it myself. I'll get the boat in the water in a week or two and check it out.
The beefed up transom was similar on my boat also, the front and back of the transom was reinforced, but like yours bolts were used this allows the water to seep in and rot the wood from the inside. Some places recommend epoxying any support wood to the transom directly or simply reinforcing it with more fiberglass, as opposed to bolts or screws.
The danger is not only a weak transom but that the rot will spread to the hull and rot the stringers which is a much worse job to fix!
I took out my bolts and removed the supports and saw bad delamination on the inside of my transom. If I pushed my transom water came out the bolt holes (and the boat had been out of the water for over a year so this was pure rainwater. I cut away the rotten glass (and caught a nasty wiff of rott!), drilled drain holes, and scraped away some of the rotten wood. To my surprise there was very little rotten wood. It seemed I could repair rather than replace the wood. I let the transom dry out for 2/3 weeks and for 2/3 days before the big repair I was drying it with a hairdryer daily. Finally I re-glassed it all up and now it is stronger than ever and I doubt I will need the supports - as the boat was originally intended and designed for use without them.
Anyway, you can't tell over the internet what needs doing, but if your sure the transom is ok thats a huge chunk of work off the restoration