Building this fully electric wheelchair was super fun, and surprisingly simple. A few bars of metal tied into the already naturally existing supports and holes on the bike makes for a great seat supports. This Off Road wheel chair has a top speed of 20mph and a range of about 20 miles. The bikes I used cost about $1400 each, So after factoring in the $50 dollars worth of metal and random odds and ends, the whole thing cost about $3000 dollars to build. Which is less than half the price and twice the performance of other off road wheelchairs on the market right now.
How to Make Hydraulic Powered Robotic Arm from Cardboard In this