But then installing an endless amount of ambient tube lighting.

You didn't mention rewiring the house in your post but I think you saw that there was  fuse box and will likely have active knob and tube throughout.

Otherwise, you could just drive a couple of posts (wood or steel) into the yard and hang the banner across it.But, if you're really hoping to make an impression, you should go with a:WACKY WAVING INFLATABLE ARM-FLAILING TUBE MAN!!!!

I later learned my nephew is educating himself  on  you tube, seminars, podcast  (free) with same info I received at RE Mentor that I payed 700 for. 

BiggerPocketsPodCastWholesaling101 You Tube ChannelKent Clothier – You Tube Memphis Invest channel

Wholesaling101 You Tube ChannelKent Clothier – You Tube Memphs Invest channel

BiggerPocketsPodCastWholesaling101 You Tube ChannelKent Clothier – You Tube Memphs Invest channel

It shouldn't break for several years if it's new and the repairs usually involve water leakages through tubes that can be repaired easily.

Dealing with things like galvanized pipes, knob and tube wiring, asbestos ceilings, lath and plaster, etc. can all be pretty expensive. 

1940's in Sacramento is usually knob and tube... you don't want to cut corners and have to deal with it later.