Can you provide the link to that Spartan 6 board with 150 LEs ?
I've been around Trenz site a few times and have not noticed that particular board.
Is this the one you have in mind?http://shop.trenz-electronic.de/catalog/product_info.php?cPath=1_65_143&products_id=917
What is confusing about the above one is that title says:
Trenz Electronic GigaBee XC6SLX150
yet Key-Specifications say:
Industrial-grade Xilinx Spartan-6 LX FPGA micromodule LX100
Also, I suspect you will not be able to use free Xilinx WebPack on LX150...