Like all the heavy truck kits of the era, getting one done requires patience and a lot of fitting up.

"Tidewater Trucker" did a great article in CM about scratch building a proper Holmes wrecker unit. Well beyond my 12 year old skills when I was knocking these out!

Today, it would be a very good idea to invest in some of the small steel machinist blocks to get the chassis square, that is really the toughest bit in the kit. If you have a taste for it, opening the doors is pretty easy to do, and it is also possible to do a steerable front end with a little bit of fabrication.

Plus the interwebs have endless scrolls of reference pics that were unheard of in 1973.

Go for it!