Just the powered seat option on the Mustang Mach E is a $1500 add-on. Add memory capability is $1500 more. BlueCruise is $2100. I don't know about the weight claim, but the price estimate doesn't seem too far off.

I guess I was thinking materials cost and that it wouldn’t translate to purchase price.

My understanding is that a lot of profit is derived from trim packages, implying the cost to consumer is heavily inflated for those options. The difference with premium packages can approach 50% of the base model cost (although that usually goes beyond electronics)