Hey ronnie
main thing is try and keep the prop shaft straight, I dont suspect that moving the engine forward or up an inch ot so would make that much diferance to weight distribution or C.of.G also like you say it also alows you more room to fit other parts if you want,
In responce to your other question i now its not quite the same in that i have a bike engine but i used 5mm for the frame founts for the grear box for that then standard box for the cradle, but for a silvertop id expact you would be fine with 5mm wouldnt go thinner i have heard of people breaking 3mm mounts but i dont think you would need to get thicker.. just over kill
Hop this helps
Tilly
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