I'm not an expert but i will try to give you some advices.
First you sad you have a Simpad CL4, this machine have 32MB rom and
16MB ram and i think it's not possible to install a familiar image nor gpe nor opie (of course it's about linux os)
If you have windows ce installed i suggest to try gowerpoint uBook (
www.gowerpoint.com) it's not free but it's a very good ebook reader for wince.
I have a SL4 Simpad and now i'm testing the third release candidate of familiar (i like very much opie) and i have installed justreader and i was a littlebit dissapointed about this software but i will try to succed with something else, maybe fbreader if i will succeed with installing.
Sorry for my bad english and welcome to the club.