Plans for my first build/s

[NapierDeltic]

Hi, I am looking for plans/ideea for my first builds.
My targets for the moment are rather utilitary engines -though I'm not intending yet to use them in any project. They should be small capacity 4 stroke singles - side valves/ OHV and OHC, also have in mind a boxer twin of same type and maybe a V-twin. I'm looking for free plans. Already spotted ETW Whippet, Vega 30/ ETW Kiwi Mk2, Hawk 40/ Nemett Ne15S / Beko 2. For Ne15S or alike belt driven OHC I haven't found yet clear plans. They should be rather stock material builds as casting would be a steep start.
Please give me your opinion about models mentioned, ease of build, alternatives...

 

[coulsea]

Model IC Engines (john-tom.com) 3rd one on this page is the webster, lots of builds on this forum.
not free but not expensive, the red farm engine gives lots of options UpshurEngineWorks - rocketr.net

 

[NapierDeltic]

Thank you for your answer, UpshurEngineWorks - rocketr.net looks very appealing.