Thought maybe I'd post this here and see if a pool of suggestions might arise for me to consider. I'm a kite buggier looking to slip into a land sailer because the field across from my house while a good size, is not really big enough for the kite buggy and kite lines. I think a little land sailer would be a perfect fit. It's a grass sports field (one soccer pitch and a ball diamond), mowed frequently but not manicured. Winds are generally light, let's assume around 15km/h typical or in the 20's but then tend to get gusty. I have a feeling this info will start to dictate wheel size/width and sail sizing.

I'd like something sort of sized like a kite buggy and of it were somewhat collapsable that would be great (I ride a wide axle, extended rail and downtube Peter Lynn buggy) and have seen the Blokart videos and like that form factor. The seating position looks to be much more "recreational" than the LLM or other more serious rigs which appeals to me despite knowing that the CG is going to be lifted significantly. I do feel like a bit wider axle makes more sense to me but I don't really know how axle width vs wheel base comes into play with land sailing. I had been diving into the LLM builds and someone suggested a Y-frame might prove more adjustable/adaptable and I like the concept but haven't found many (any) plans to ponder.

Does anyone have any direction/photos they could point me to?

one of the poblems,well the main one realy,with using a land yacht on grass,is that there is a lot of drag . With a kite buggy all of the force generated by the kite is upwards and sideways ,so not that much drag,so the weight on the frame and wheels is reduced .
With a land yacht all of the force is sideways and down.there is little upwards force, If you are going to use a land yacht you will need to source those wide balloon tyres that I have seen buggiers use. I think Seagull do an all terrain land yacht,have a look on the site.These sized wheels probably would work ok.
If you use standard wheels ,you may get going with a large 6 or 7meter sail but because of the drag the rear would likely dig into the surface and cause a strong tipping effect(hiking) and cause you to constantly sheet out to reduce it,thereby slowing down,and on and on.
As to size of yacht,there are many plans about,its all a bit of a personal choice ,however if you do build yourself it's advisable to stay within one of the class regulations since they have little resale value to any who want to enter races.
All said however Good luck .