1994 amigo bed cover /tires?

[scottrox]

hello i own a 1994 isuzu amigo i am trying to change the SUv type removable top with a more bed style top/cover but im not sure what to look for or where to look to find one also can we DIY the bed cover?? also im wanting to change the tire size on my amigo to be a bit bigger for off road i have 245/70/16 right now what would be a good tire to replace the 245 with?

also i have a friend that owns a 94-95 honda passport it has a 24 valve v6 the motor was made by isuzu motors will this motor work in my amigo??

thanks very much for your help.