Hi,
Enjoyed looking at the advice re-making a land yatch on Sea Breeze, very helpful - thanks. Thought I would add my effort as it might be helpful to others. Sorry there are no "making pics", but look at the You Tube vid and there are some stills of various areas which might help

Not very happy with the foot steering as it gets a bit sqirly at 50kph. Not sure how fast these things should go but feel I'm only going about 60% at present, but being an old bloke, I bottle it! My son is in the vid, no sense, no fear! In a gust the back wheels let go sideways, is this 'cos the wheelbase is too wide, or if I put the front wheel further forward will this add more weight to the back wheels? or have I messed up the geometry somewhere? I have bought a Blokart a few weeks ago, but did not want to copy it.

I have windsurfed for years and can tune a sail. Blokart sails (although expensive) seem pretty horrible. The straight boom kills the foil shape in the sail and the floppy mast looks dreadful. My cart ate up the Blokart on all points of sailing, perhaps that's because I have not sailed the Blokart much. I had a 4.2m on my yatch and the Blokart had a 4m but the bottom 600mm of a Blokart sail does nothing!
Anyway, have a look at YouTube. titled= Landyatch testing on Pembrey Beach, a poor man's Blokart!!
Any advice appreciated.