Where are you located? The challenger is a great daysailor. There is more room in the cockpit and better visibility than alot of larger boats. The head originally pumped in seawater and pumped it right back out. Even though the head is right under the Vee Berth, there is more room there than in the 26 which has a little area on the port side but you have to be pencil thin to fit in there...LOL
I am far from an expert but had one for a number of years. My poor little Challenger sank last winter and I have refloated it but have not restored or disposed of it as of yet. The standing rigging is intact if you need information or if you want to come and get it, that might just solve your problems...LOL
Mariner 28 "Sweet Pea"