I built an SHG Shadow in the lounge of our small flat in Acton (West London) over 40 years ago. I powered it with a Webra .20 and sailed it mainly at Black Park, near Slough, and also at Prince Park in Eastbourne.
I have no recollection of what happened to it, I assume I sold it when it became difficult to find places to use IC engines.
About 18 months ago, I saw a just started Shadow for sale on ebay which was only about 15 miles away, so I contacted the buyer, pressed the banknotes into his hand, and when I got home and unpacked it, 40+ years evaporated, just looking at the kit.
It had been started, but I decided to remove everything the previous builder had done and start again. Hopefully the pictures will show the brushed motor and crude speed controller.
I trimmed the hull back to the correct line, replaced the prop shaft and rudder, and installed a 2836 1000kv brushless out runner. At that point, some other boat sailed into my life and the Shadow was put away until the warmer weather made it possible to glass the hull and deck together without stinking the house out. Somehow, I managed to drift through the summer without thinking of the Shadow, but retrieved it from the loft yesterday and decided to take steps to finish to and get it on the water, years after it was started.
I have several (at least!) boats to build or restore, but this one is currently top of the pile.

My current Shadow was barely started when I bought it, so the only aroma it possesses is the smell of the resin used to mould the hull & deck.

Like you, I have spent very little on it so far, spare receiver & ESC, spare motor and motor mount, spare prop shaft & tube. I even knocked up a stand for it from some scrap ply.

I've got the motor in today, and connected to the prop shaft, but had some decorating to do so couldn't make the connectors for the ESC - hopefully tomorrow.