Just some stuff I threw together last week.
From concept to construction, all in about 1-2 hours.
That plate of steel the bike is tak'ed to is about 7 inches in length, and the bike itself is roughly 8-9 inches long.
(https://forums.fanime.com/proxy.php?request=http%3A%2F%2Fi129.photobucket.com%2Falbums%2Fp237%2FArraxus%2F100_2275.jpg&hash=2938652d234306a4edb5aa201fb48c2b528442ca)
(https://forums.fanime.com/proxy.php?request=http%3A%2F%2Fi129.photobucket.com%2Falbums%2Fp237%2FArraxus%2F100_2278.jpg&hash=f0ed90823dc07a8a2c9c4655c042823406f464bf)
Got some more, this one is a stainless and mild steel creation, a phoenix. I think it's about 8 inches from wingtip to wingtip... since I don't have it (sold for 30$) anymore I don't have exact measurements, however it took most of a morning to complete.
(https://forums.fanime.com/proxy.php?request=http%3A%2F%2Fi129.photobucket.com%2Falbums%2Fp237%2FArraxus%2FIMG_0708.jpg&hash=ad1e8ee4f493d3439ada024a6380a392cad351af)
since I got a few photos of it.. the rest are links.
http://i129.photobucket.com/albums/p237/Arraxus/IMG_0706.jpg
http://i129.photobucket.com/albums/p237/Arraxus/IMG_0707.jpg
http://i129.photobucket.com/albums/p237/Arraxus/IMG_0704.jpg